21112510401 has 12 divisors (see below), whose sum is σ = 30640381200. Its totient is φ = 14008299480.

The previous prime is 21112510399. The next prime is 21112510411. The reversal of 21112510401 is 10401521112.

21112510401 is a `hidden beast` number, since 2 + 1 + 11 + 251 + 0 + 401 = 666.

It is not a de Polignac number, because 21112510401 - 2¹ = 21112510399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112510411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5556951 + ... + 5560748.

It is an arithmetic number, because the mean of its divisors is an integer number (2553365100).

Almost surely, 2^21112510401 is an apocalyptic number.

It is an amenable number.

21112510401 is a deficient number, since it is larger than the sum of its proper divisors (9527870799).

21112510401 is a wasteful number, since it uses less digits than its factorization.

21112510401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11117916 (or 11117913 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The spelling of 21112510401 in words is "twenty-one billion, one hundred twelve million, five hundred ten thousand, four hundred one".