21132212008 has 32 divisors (see below), whose sum is σ = 39802181760. Its totient is φ = 10518356800.

The previous prime is 21132211987. The next prime is 21132212009. The reversal of 21132212008 is 80021223112.

It is a self number, because there is not a number n which added to its sum of digits gives 21132212008.

It is not an unprimeable number, because it can be changed into a prime (21132212009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3946533 + ... + 3951883.

It is an arithmetic number, because the mean of its divisors is an integer number (1243818180).

Almost surely, 2^21132212008 is an apocalyptic number.

It is an amenable number.

21132212008 is a deficient number, since it is larger than the sum of its proper divisors (18669969752).

21132212008 is a wasteful number, since it uses less digits than its factorization.

21132212008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7497 (or 7493 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The spelling of 21132212008 in words is "twenty-one billion, one hundred thirty-two million, two hundred twelve thousand, eight".