31311321101021 has 16 divisors (see below), whose sum is σ = 33788454336000. Its totient is φ = 28843987014720.

The previous prime is 31311321100973. The next prime is 31311321101029. The reversal of 31311321101021 is 12010112311313.

It is a cyclic number.

It is not a de Polignac number, because 31311321101021 - 2¹⁰ = 31311321099997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31311321100984 and 31311321101002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311321101029) 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, 363572756 + ... + 363658866.

It is an arithmetic number, because the mean of its divisors is an integer number (2111778396000).

Almost surely, 2^{31311321101021} is an apocalyptic number.

It is an amenable number.

31311321101021 is a deficient number, since it is larger than the sum of its proper divisors (2477133234979).

31311321101021 is a wasteful number, since it uses less digits than its factorization.

31311321101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142676.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 31311321101021 its reverse (12010112311313), we get a palindrome (43321433412334).

The spelling of 31311321101021 in words is "thirty-one trillion, three hundred eleven billion, three hundred twenty-one million, one hundred one thousand, twenty-one".