31231130120211 has 32 divisors (see below), whose sum is σ = 47653119590400. Its totient is φ = 17822804014080.

The previous prime is 31231130120207. The next prime is 31231130120249. The reversal of 31231130120211 is 11202103113213.

It is not a de Polignac number, because 31231130120211 - 2² = 31231130120207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (31231130120291) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 220939246 + ... + 221080556.

It is an arithmetic number, because the mean of its divisors is an integer number (1489159987200).

Almost surely, 2^{31231130120211} is an apocalyptic number.

31231130120211 is a deficient number, since it is larger than the sum of its proper divisors (16421989470189).

31231130120211 is a wasteful number, since it uses less digits than its factorization.

31231130120211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155139.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 31231130120211 its reverse (11202103113213), we get a palindrome (42433233233424).

The spelling of 31231130120211 in words is "thirty-one trillion, two hundred thirty-one billion, one hundred thirty million, one hundred twenty thousand, two hundred eleven".