21331023432 has 32 divisors (see below), whose sum is σ = 53438918400. Its totient is φ = 7095493184.

The previous prime is 21331023421. The next prime is 21331023443. The reversal of 21331023432 is 23432013312.

It is an interprime number because it is at equal distance from previous prime (21331023421) and next prime (21331023443).

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 916263 + ... + 939254.

It is an arithmetic number, because the mean of its divisors is an integer number (1669966200).

Almost surely, 2^21331023432 is an apocalyptic number.

It is an amenable number.

21331023432 is an abundant number, since it is smaller than the sum of its proper divisors (32107894968).

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

21331023432 is a wasteful number, since it uses less digits than its factorization.

21331023432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1856005 (or 1856001 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 21331023432 its reverse (23432013312), we get a palindrome (44763036744).

The spelling of 21331023432 in words is "twenty-one billion, three hundred thirty-one million, twenty-three thousand, four hundred thirty-two".