21161338360 has 16 divisors (see below), whose sum is σ = 47613011400. Its totient is φ = 8464535328.

The previous prime is 21161338351. The next prime is 21161338381. The reversal of 21161338360 is 6383316112.

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, 264516690 + ... + 264516769.

Almost surely, 2^21161338360 is an apocalyptic number.

21161338360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21161338360 is an abundant number, since it is smaller than the sum of its proper divisors (26451673040).

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

21161338360 is a wasteful number, since it uses less digits than its factorization.

21161338360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529033470 (or 529033466 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The spelling of 21161338360 in words is "twenty-one billion, one hundred sixty-one million, three hundred thirty-eight thousand, three hundred sixty".