21131234232 has 16 divisors (see below), whose sum is σ = 52828085640. Its totient is φ = 7043744736.

The previous prime is 21131234219. The next prime is 21131234233. The reversal of 21131234232 is 23243213112.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 880468093 = 21131234232 / (2 + 1 + 1 + 3 + 1 + 2 + 3 + 4 + 2 + 3 + 2).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131234233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 440234023 + ... + 440234070.

Almost surely, 2^21131234232 is an apocalyptic number.

It is an amenable number.

21131234232 is an abundant number, since it is smaller than the sum of its proper divisors (31696851408).

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

21131234232 is a wasteful number, since it uses less digits than its factorization.

21131234232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880468102 (or 880468098 counting only the distinct ones).

The product of its digits is 1728, while the sum is 24.

Adding to 21131234232 its reverse (23243213112), we get a palindrome (44374447344).

The spelling of 21131234232 in words is "twenty-one billion, one hundred thirty-one million, two hundred thirty-four thousand, two hundred thirty-two".