21202112308 has 12 divisors (see below), whose sum is σ = 39957827140. Its totient is φ = 9785590272.

The previous prime is 21202112303. The next prime is 21202112311. The reversal of 21202112308 is 80321120212.

It can be written as a sum of positive squares in 2 ways, for example, as 6546104464 + 14656007844 = 80908^2 + 121062^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202112303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203866413 + ... + 203866516.

Almost surely, 2^21202112308 is an apocalyptic number.

It is an amenable number.

21202112308 is a deficient number, since it is larger than the sum of its proper divisors (18755714832).

21202112308 is a wasteful number, since it uses less digits than its factorization.

21202112308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407732946 (or 407732944 counting only the distinct ones).

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

The spelling of 21202112308 in words is "twenty-one billion, two hundred two million, one hundred twelve thousand, three hundred eight".