21961216539300 has 36 divisors (see below), whose sum is σ = 63541119854576. Its totient is φ = 5856324410400.

The previous prime is 21961216539257. The next prime is 21961216539337. The reversal of 21961216539300 is 393561216912.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21961216539300.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36602027266 + ... + 36602027865.

Almost surely, 2^{21961216539300} is an apocalyptic number.

21961216539300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21961216539300 is an abundant number, since it is smaller than the sum of its proper divisors (41579903315276).

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

21961216539300 is a wasteful number, since it uses less digits than its factorization.

21961216539300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73204055148 (or 73204055141 counting only the distinct ones).

The product of its (nonzero) digits is 524880, while the sum is 48.

The spelling of 21961216539300 in words is "twenty-one trillion, nine hundred sixty-one billion, two hundred sixteen million, five hundred thirty-nine thousand, three hundred".