20215131051 has 16 divisors (see below), whose sum is σ = 27912276000. Its totient is φ = 13005707520.

The previous prime is 20215131049. The next prime is 20215131109. The reversal of 20215131051 is 15013151202.

It is not a de Polignac number, because 20215131051 - 2¹ = 20215131049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20215131551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1032426 + ... + 1051823.

It is an arithmetic number, because the mean of its divisors is an integer number (1744517250).

Almost surely, 2^20215131051 is an apocalyptic number.

20215131051 is a deficient number, since it is larger than the sum of its proper divisors (7697144949).

20215131051 is a wasteful number, since it uses less digits than its factorization.

20215131051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2084366.

The product of its (nonzero) digits is 300, while the sum is 21.

Adding to 20215131051 its reverse (15013151202), we get a palindrome (35228282253).

The spelling of 20215131051 in words is "twenty billion, two hundred fifteen million, one hundred thirty-one thousand, fifty-one".