31311312221021 has 8 divisors (see below), whose sum is σ = 35784601353600. Its totient is φ = 26838084220848.

The previous prime is 31311312220997. The next prime is 31311312221029. The reversal of 31311312221021 is 12012221311313.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 31311312221021 - 2²² = 31311308026717 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 (31311312221029) 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, 14180246 + ... + 16238903.

It is an arithmetic number, because the mean of its divisors is an integer number (4473075169200).

Almost surely, 2^{31311312221021} is an apocalyptic number.

It is an amenable number.

31311312221021 is a deficient number, since it is larger than the sum of its proper divisors (4473289132579).

31311312221021 is a wasteful number, since it uses less digits than its factorization.

31311312221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30566203.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 31311312221021 its reverse (12012221311313), we get a palindrome (43323533532334).

The spelling of 31311312221021 in words is "thirty-one trillion, three hundred eleven billion, three hundred twelve million, two hundred twenty-one thousand, twenty-one".