1321121232 has 80 divisors (see below), whose sum is σ = 3802584000. Its totient is φ = 439157376.

The previous prime is 1321121231. The next prime is 1321121233. The reversal of 1321121232 is 2321211231.

It is an interprime number because it is at equal distance from previous prime (1321121231) and next prime (1321121233).

It is a super-2 number, since 2×1321121232² = 3490722619282395648, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321121231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159694 + ... + 167762.

It is an arithmetic number, because the mean of its divisors is an integer number (47532300).

Almost surely, 2^1321121232 is an apocalyptic number.

1321121232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321121232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1901292000).

1321121232 is an abundant number, since it is smaller than the sum of its proper divisors (2481462768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321121232 is a wasteful number, since it uses less digits than its factorization.

1321121232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8465 (or 8453 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1321121232 is about 36347.2314213889. The cubic root of 1321121232 is about 1097.2718155475.

Adding to 1321121232 its reverse (2321211231), we get a palindrome (3642332463).

It can be divided in two parts, 13211 and 21232, that added together give a palindrome (34443).

The spelling of 1321121232 in words is "one billion, three hundred twenty-one million, one hundred twenty-one thousand, two hundred thirty-two".