21034431232 has 72 divisors (see below), whose sum is σ = 44314124400. Its totient is φ = 9937170432.

The previous prime is 21034431227. The next prime is 21034431263. The reversal of 21034431232 is 23213443012.

It is a junction number, because it is equal to n+sod(n) for n = 21034431197 and 21034431206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1886538 + ... + 1897654.

It is an arithmetic number, because the mean of its divisors is an integer number (615473950).

Almost surely, 2^21034431232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21034431232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22157062200).

21034431232 is an abundant number, since it is smaller than the sum of its proper divisors (23279693168).

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

21034431232 is a wasteful number, since it uses less digits than its factorization.

21034431232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11541 (or 11527 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21034431232 its reverse (23213443012), we get a palindrome (44247874244).

The spelling of 21034431232 in words is "twenty-one billion, thirty-four million, four hundred thirty-one thousand, two hundred thirty-two".