20651050521 has 12 divisors (see below), whose sum is σ = 30934084272. Its totient is φ = 13767366852.

The previous prime is 20651050513. The next prime is 20651050531. The reversal of 20651050521 is 12505015602.

20651050521 is a `hidden beast` number, since 2 + 0 + 651 + 0 + 5 + 0 + 5 + 2 + 1 = 666.

It is not a de Polignac number, because 20651050521 - 2³ = 20651050513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20651050531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42491631 + ... + 42492116.

It is an arithmetic number, because the mean of its divisors is an integer number (2577840356).

Almost surely, 2^20651050521 is an apocalyptic number.

It is an amenable number.

20651050521 is a deficient number, since it is larger than the sum of its proper divisors (10283033751).

20651050521 is an frugal number, since it uses more digits than its factorization.

20651050521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84983762 (or 84983750 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The spelling of 20651050521 in words is "twenty billion, six hundred fifty-one million, fifty thousand, five hundred twenty-one".