1213221132 has 48 divisors (see below), whose sum is σ = 3155399520. Its totient is φ = 403119936.

The previous prime is 1213221077. The next prime is 1213221137. The reversal of 1213221132 is 2311223121.

It is a super-2 number, since 2×1213221132² = 2943811030262722848, 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.

It is not an unprimeable number, because it can be changed into a prime (1213221137) 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, 16518 + ... + 51954.

It is an arithmetic number, because the mean of its divisors is an integer number (65737490).

Almost surely, 2^1213221132 is an apocalyptic number.

1213221132 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1213221132 is an abundant number, since it is smaller than the sum of its proper divisors (1942178388).

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

1213221132 is a wasteful number, since it uses less digits than its factorization.

1213221132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35767 (or 35759 counting only the distinct ones).

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

The square root of 1213221132 is about 34831.3240058428. The cubic root of 1213221132 is about 1066.5469761968.

Adding to 1213221132 its reverse (2311223121), we get a palindrome (3524444253).

The spelling of 1213221132 in words is "one billion, two hundred thirteen million, two hundred twenty-one thousand, one hundred thirty-two".