31112312211 has 48 divisors (see below), whose sum is σ = 46691749728. Its totient is φ = 19946995200.

The previous prime is 31112312201. The next prime is 31112312233. The reversal of 31112312211 is 11221321113.

31112312211 is a `hidden beast` number, since 31 + 112 + 312 + 211 = 666.

It is not a de Polignac number, because 31112312211 - 2²² = 31108117907 is a prime.

It is a super-2 number, since 2×31112312211² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31112312201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23551431 + ... + 23552751.

It is an arithmetic number, because the mean of its divisors is an integer number (972744786).

Almost surely, 2^31112312211 is an apocalyptic number.

31112312211 is a deficient number, since it is larger than the sum of its proper divisors (15579437517).

31112312211 is a wasteful number, since it uses less digits than its factorization.

31112312211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2132 (or 2129 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 31112312211 its reverse (11221321113), we get a palindrome (42333633324).

The spelling of 31112312211 in words is "thirty-one billion, one hundred twelve million, three hundred twelve thousand, two hundred eleven".