21351641514156 has 18 divisors (see below), whose sum is σ = 53972204938652. Its totient is φ = 7117213838040.

The previous prime is 21351641514109. The next prime is 21351641514197. The reversal of 21351641514156 is 65141514615312.

21351641514156 is a `hidden beast` number, since 2 + 1 + 3 + 516 + 41 + 5 + 1 + 41 + 56 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 296550576550 + ... + 296550576621.

Almost surely, 2^{21351641514156} is an apocalyptic number.

It is an amenable number.

21351641514156 is an abundant number, since it is smaller than the sum of its proper divisors (32620563424496).

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

21351641514156 is a wasteful number, since it uses less digits than its factorization.

21351641514156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593101153181 (or 593101153176 counting only the distinct ones).

The product of its digits is 432000, while the sum is 45.

The spelling of 21351641514156 in words is "twenty-one trillion, three hundred fifty-one billion, six hundred forty-one million, five hundred fourteen thousand, one hundred fifty-six".