21261162130158 has 64 divisors (see below), whose sum is σ = 43372442985984. Its totient is φ = 6946212240000.

The previous prime is 21261162130157. The next prime is 21261162130177. The reversal of 21261162130158 is 85103126116212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21261162130157) 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, 238976583 + ... + 239065533.

It is an arithmetic number, because the mean of its divisors is an integer number (677694421656).

Almost surely, 2^{21261162130158} is an apocalyptic number.

21261162130158 is an abundant number, since it is smaller than the sum of its proper divisors (22111280855826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21261162130158 is a wasteful number, since it uses less digits than its factorization.

21261162130158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91321.

The product of its (nonzero) digits is 34560, while the sum is 39.

The spelling of 21261162130158 in words is "twenty-one trillion, two hundred sixty-one billion, one hundred sixty-two million, one hundred thirty thousand, one hundred fifty-eight".