21131200131331 has 64 divisors (see below), whose sum is σ = 23156529371136. Its totient is φ = 19228029004800.

The previous prime is 21131200131323. The next prime is 21131200131337. The reversal of 21131200131331 is 13313100213112.

It is a cyclic number.

It is not a de Polignac number, because 21131200131331 - 2³ = 21131200131323 is a prime.

It is a super-2 number, since 2×21131200131331² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21131200131337) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3735404655 + ... + 3735410311.

It is an arithmetic number, because the mean of its divisors is an integer number (361820771424).

Almost surely, 2^{21131200131331} is an apocalyptic number.

21131200131331 is a deficient number, since it is larger than the sum of its proper divisors (2025329239805).

21131200131331 is a wasteful number, since it uses less digits than its factorization.

21131200131331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6292.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 21131200131331 its reverse (13313100213112), we get a palindrome (34444300344443).

The spelling of 21131200131331 in words is "twenty-one trillion, one hundred thirty-one billion, two hundred million, one hundred thirty-one thousand, three hundred thirty-one".