1331221032 has 48 divisors (see below), whose sum is σ = 3656184480. Its totient is φ = 437488800.

The previous prime is 1331221019. The next prime is 1331221037. The reversal of 1331221032 is 2301221331.

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

It is a junction number, because it is equal to n+sod(n) for n = 1331220996 and 1331221014.

It is not an unprimeable number, because it can be changed into a prime (1331221037) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 125094 + ... + 135317.

It is an arithmetic number, because the mean of its divisors is an integer number (76170510).

Almost surely, 2^1331221032 is an apocalyptic number.

1331221032 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1331221032 is an abundant number, since it is smaller than the sum of its proper divisors (2324963448).

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

1331221032 is a wasteful number, since it uses less digits than its factorization.

1331221032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260494 (or 260487 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1331221032 is about 36485.9018252256. The cubic root of 1331221032 is about 1100.0608869879.

Adding to 1331221032 its reverse (2301221331), we get a palindrome (3632442363).

The spelling of 1331221032 in words is "one billion, three hundred thirty-one million, two hundred twenty-one thousand, thirty-two".