21015435232 has 48 divisors (see below), whose sum is σ = 46355328432. Its totient is φ = 9294289920.

The previous prime is 21015435229. The next prime is 21015435251. The reversal of 21015435232 is 23253451012.

It is a self number, because there is not a number n which added to its sum of digits gives 21015435232.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 793773 + ... + 819820.

It is an arithmetic number, because the mean of its divisors is an integer number (965736009).

Almost surely, 2^21015435232 is an apocalyptic number.

21015435232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21015435232 is an abundant number, since it is smaller than the sum of its proper divisors (25339893200).

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

21015435232 is a wasteful number, since it uses less digits than its factorization.

21015435232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1613651 (or 1613643 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 21015435232 its reverse (23253451012), we get a palindrome (44268886244).

The spelling of 21015435232 in words is "twenty-one billion, fifteen million, four hundred thirty-five thousand, two hundred thirty-two".