21131251140024 has 80 divisors (see below), whose sum is σ = 59188188034800. Its totient is φ = 7043617225728.

The previous prime is 21131251140023. The next prime is 21131251140037. The reversal of 21131251140024 is 42004115213112.

21131251140024 is a `hidden beast` number, since 2 + 1 + 1 + 3 + 1 + 251 + 1 + 400 + 2 + 4 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21131251140024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131251140023) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 37589464 + ... + 38147480.

It is an arithmetic number, because the mean of its divisors is an integer number (739852350435).

Almost surely, 2^{21131251140024} is an apocalyptic number.

21131251140024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21131251140024 is an abundant number, since it is smaller than the sum of its proper divisors (38056936894776).

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

21131251140024 is a wasteful number, since it uses less digits than its factorization.

21131251140024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616474 (or 616461 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

Adding to 21131251140024 its reverse (42004115213112), we get a palindrome (63135366353136).

The spelling of 21131251140024 in words is "twenty-one trillion, one hundred thirty-one billion, two hundred fifty-one million, one hundred forty thousand, twenty-four".