31311101311221 has 8 divisors (see below), whose sum is σ = 41930441349280. Its totient is φ = 20782914406992.

The previous prime is 31311101311207. The next prime is 31311101311253. The reversal of 31311101311221 is 12211310111313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31311101311221 - 2¹⁵ = 31311101278453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311101311271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22788282655 + ... + 22788284028.

It is an arithmetic number, because the mean of its divisors is an integer number (5241305168660).

Almost surely, 2^{31311101311221} is an apocalyptic number.

It is an amenable number.

31311101311221 is a deficient number, since it is larger than the sum of its proper divisors (10619340038059).

31311101311221 is a wasteful number, since it uses less digits than its factorization.

31311101311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45576566915.

The product of its (nonzero) digits is 108, while the sum is 21.

Adding to 31311101311221 its reverse (12211310111313), we get a palindrome (43522411422534).

The spelling of 31311101311221 in words is "thirty-one trillion, three hundred eleven billion, one hundred one million, three hundred eleven thousand, two hundred twenty-one".