21311222331131 has 16 divisors (see below), whose sum is σ = 21602546812800. Its totient is φ = 21020444390400.

The previous prime is 21311222331109. The next prime is 21311222331163. The reversal of 21311222331131 is 13113322211312.

It is a cyclic number.

It is not a de Polignac number, because 21311222331131 - 2³⁴ = 21294042461947 is a prime.

It is a super-2 number, since 2×21311222331131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21311222331131.

It is not an unprimeable number, because it can be changed into a prime (21311222361131) 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, 511272611 + ... + 511314291.

It is an arithmetic number, because the mean of its divisors is an integer number (1350159175800).

Almost surely, 2^{21311222331131} is an apocalyptic number.

21311222331131 is a deficient number, since it is larger than the sum of its proper divisors (291324481669).

21311222331131 is a wasteful number, since it uses less digits than its factorization.

21311222331131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48070.

The product of its digits is 1296, while the sum is 26.

Adding to 21311222331131 its reverse (13113322211312), we get a palindrome (34424544542443).

The spelling of 21311222331131 in words is "twenty-one trillion, three hundred eleven billion, two hundred twenty-two million, three hundred thirty-one thousand, one hundred thirty-one".