21150013125601 has 32 divisors (see below), whose sum is σ = 22813305039360. Its totient is φ = 19534494470400.

The previous prime is 21150013125599. The next prime is 21150013125617. The reversal of 21150013125601 is 10652131005112.

It is a cyclic number.

It is not a de Polignac number, because 21150013125601 - 2¹ = 21150013125599 is a prime.

It is a super-2 number, since 2×21150013125601² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21150013125601.

It is not an unprimeable number, because it can be changed into a prime (21150013125401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2155739986 + ... + 2155749796.

It is an arithmetic number, because the mean of its divisors is an integer number (712915782480).

Almost surely, 2^{21150013125601} is an apocalyptic number.

It is an amenable number.

21150013125601 is a deficient number, since it is larger than the sum of its proper divisors (1663291913759).

21150013125601 is a wasteful number, since it uses less digits than its factorization.

21150013125601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13405.

The product of its (nonzero) digits is 1800, while the sum is 28.

The spelling of 21150013125601 in words is "twenty-one trillion, one hundred fifty billion, thirteen million, one hundred twenty-five thousand, six hundred one".