21333031131 has 16 divisors (see below), whose sum is σ = 28849111200. Its totient is φ = 14020435968.

The previous prime is 21333031091. The next prime is 21333031169. The reversal of 21333031131 is 13113033312.

It is not a de Polignac number, because 21333031131 - 2¹¹ = 21333029083 is a prime.

It is a super-2 number, since 2×21333031131² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21333031098 and 21333031107.

It is not an unprimeable number, because it can be changed into a prime (21333031171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28566 + ... + 208523.

It is an arithmetic number, because the mean of its divisors is an integer number (1803069450).

Almost surely, 2^21333031131 is an apocalyptic number.

21333031131 is a deficient number, since it is larger than the sum of its proper divisors (7516080069).

21333031131 is a wasteful number, since it uses less digits than its factorization.

21333031131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237518.

The product of its (nonzero) digits is 486, while the sum is 21.

Adding to 21333031131 its reverse (13113033312), we get a palindrome (34446064443).

The spelling of 21333031131 in words is "twenty-one billion, three hundred thirty-three million, thirty-one thousand, one hundred thirty-one".