21211303131 has 12 divisors (see below), whose sum is σ = 31466618352. Its totient is φ = 13758682896.

The previous prime is 21211303109. The next prime is 21211303187. The reversal of 21211303131 is 13130311212.

21211303131 is a `hidden beast` number, since 21 + 211 + 303 + 131 = 666.

It is not a de Polignac number, because 21211303131 - 2⁶ = 21211303067 is a prime.

It is a super-2 number, since 2×21211303131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21211303231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31848471 + ... + 31849136.

It is an arithmetic number, because the mean of its divisors is an integer number (2622218196).

Almost surely, 2^21211303131 is an apocalyptic number.

21211303131 is a deficient number, since it is larger than the sum of its proper divisors (10255315221).

21211303131 is a wasteful number, since it uses less digits than its factorization.

21211303131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63697650 (or 63697647 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21211303131 its reverse (13130311212), we get a palindrome (34341614343).

The spelling of 21211303131 in words is "twenty-one billion, two hundred eleven million, three hundred three thousand, one hundred thirty-one".