21210034432 has 36 divisors (see below), whose sum is σ = 42380191756. Its totient is φ = 10594252800.

The previous prime is 21210034427. The next prime is 21210034451. The reversal of 21210034432 is 23443001212.

It can be written as a sum of positive squares in 2 ways, for example, as 15431602176 + 5778432256 = 124224^2 + 76016^2 .

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, 213682 + ... + 296782.

Almost surely, 2^21210034432 is an apocalyptic number.

It is an amenable number.

21210034432 is a deficient number, since it is larger than the sum of its proper divisors (21170157324).

21210034432 is an frugal number, since it uses more digits than its factorization.

21210034432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84114 (or 84100 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21210034432 its reverse (23443001212), we get a palindrome (44653035644).

The spelling of 21210034432 in words is "twenty-one billion, two hundred ten million, thirty-four thousand, four hundred thirty-two".