21131499121338 has 64 divisors (see below), whose sum is σ = 43779815494272. Its totient is φ = 6794419357440.

The previous prime is 21131499121321. The next prime is 21131499121357. The reversal of 21131499121338 is 83312199413112.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29101420 + ... + 29818712.

It is an arithmetic number, because the mean of its divisors is an integer number (684059617098).

Almost surely, 2^{21131499121338} is an apocalyptic number.

21131499121338 is an abundant number, since it is smaller than the sum of its proper divisors (22648316372934).

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

21131499121338 is a wasteful number, since it uses less digits than its factorization.

21131499121338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718479.

The product of its digits is 279936, while the sum is 48.

The spelling of 21131499121338 in words is "twenty-one trillion, one hundred thirty-one billion, four hundred ninety-nine million, one hundred twenty-one thousand, three hundred thirty-eight".