31011112312221 has 16 divisors (see below), whose sum is σ = 42410461722048. Its totient is φ = 20144200329600.

The previous prime is 31011112312217. The next prime is 31011112312231. The reversal of 31011112312221 is 12221321111013.

It is not a de Polignac number, because 31011112312221 - 2² = 31011112312217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31011112312231) 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, 160082910 + ... + 160276511.

It is an arithmetic number, because the mean of its divisors is an integer number (2650653857628).

Almost surely, 2^{31011112312221} is an apocalyptic number.

It is an amenable number.

31011112312221 is a deficient number, since it is larger than the sum of its proper divisors (11399349409827).

31011112312221 is a wasteful number, since it uses less digits than its factorization.

31011112312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320360252.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 31011112312221 its reverse (12221321111013), we get a palindrome (43232433423234).

The spelling of 31011112312221 in words is "thirty-one trillion, eleven billion, one hundred twelve million, three hundred twelve thousand, two hundred twenty-one".