21043231032 has 64 divisors (see below), whose sum is σ = 53288928000. Its totient is φ = 6923780864.

The previous prime is 21043231021. The next prime is 21043231043. The reversal of 21043231032 is 23013234012.

It is an interprime number because it is at equal distance from previous prime (21043231021) and next prime (21043231043).

It is a super-2 number, since 2×21043231032² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2623444 + ... + 2631452.

It is an arithmetic number, because the mean of its divisors is an integer number (832639500).

Almost surely, 2^21043231032 is an apocalyptic number.

It is an amenable number.

21043231032 is an abundant number, since it is smaller than the sum of its proper divisors (32245696968).

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

21043231032 is a wasteful number, since it uses less digits than its factorization.

21043231032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9420 (or 9416 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21043231032 its reverse (23013234012), we get a palindrome (44056465044).

The spelling of 21043231032 in words is "twenty-one billion, forty-three million, two hundred thirty-one thousand, thirty-two".