21103212032 has 40 divisors (see below), whose sum is σ = 48188816016. Its totient is φ = 9044232192.

The previous prime is 21103212007. The next prime is 21103212041. The reversal of 21103212032 is 23021230112.

It is a self number, because there is not a number n which added to its sum of digits gives 21103212032.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2940503 + ... + 2947670.

Almost surely, 2^21103212032 is an apocalyptic number.

It is an amenable number.

21103212032 is an abundant number, since it is smaller than the sum of its proper divisors (27085603984).

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

21103212032 is an frugal number, since it uses more digits than its factorization.

21103212032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5888198 (or 5888182 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21103212032 its reverse (23021230112), we get a palindrome (44124442144).

The spelling of 21103212032 in words is "twenty-one billion, one hundred three million, two hundred twelve thousand, thirty-two".