21150013123131 has 32 divisors (see below), whose sum is σ = 28576201359360. Its totient is φ = 13913296210944.

The previous prime is 21150013123097. The next prime is 21150013123163. The reversal of 21150013123131 is 13132131005112.

It is not a de Polignac number, because 21150013123131 - 2⁷ = 21150013123003 is a prime.

It is a super-2 number, since 2×21150013123131² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21150013123231) 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, 98084971 + ... + 98300363.

It is an arithmetic number, because the mean of its divisors is an integer number (893006292480).

Almost surely, 2^{21150013123131} is an apocalyptic number.

21150013123131 is a deficient number, since it is larger than the sum of its proper divisors (7426188236229).

21150013123131 is a wasteful number, since it uses less digits than its factorization.

21150013123131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216995.

The product of its (nonzero) digits is 540, while the sum is 24.

Adding to 21150013123131 its reverse (13132131005112), we get a palindrome (34282144128243).

The spelling of 21150013123131 in words is "twenty-one trillion, one hundred fifty billion, thirteen million, one hundred twenty-three thousand, one hundred thirty-one".