21153131400 has 96 divisors (see below), whose sum is σ = 65605176000. Its totient is φ = 5638214400.

The previous prime is 21153131383. The next prime is 21153131401. The reversal of 21153131400 is 413135112.

It is not an unprimeable number, because it can be changed into a prime (21153131401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1522485 + ... + 1536315.

It is an arithmetic number, because the mean of its divisors is an integer number (683387250).

Almost surely, 2^21153131400 is an apocalyptic number.

21153131400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21153131400 is an abundant number, since it is smaller than the sum of its proper divisors (44452044600).

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

21153131400 is a wasteful number, since it uses less digits than its factorization.

21153131400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16399 (or 16390 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 21153131400 its reverse (413135112), we get a palindrome (21566266512).

The spelling of 21153131400 in words is "twenty-one billion, one hundred fifty-three million, one hundred thirty-one thousand, four hundred".