31221331013021 has 16 divisors (see below), whose sum is σ = 31546498334400. Its totient is φ = 30897048779520.

The previous prime is 31221331013009. The next prime is 31221331013053. The reversal of 31221331013021 is 12031013312213.

It is a cyclic number.

It is not a de Polignac number, because 31221331013021 - 2¹⁴ = 31221330996637 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 (31221331016021) 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, 260093906 + ... + 260213916.

It is an arithmetic number, because the mean of its divisors is an integer number (1971656145900).

Almost surely, 2^{31221331013021} is an apocalyptic number.

It is an amenable number.

31221331013021 is a deficient number, since it is larger than the sum of its proper divisors (325167321379).

31221331013021 is a wasteful number, since it uses less digits than its factorization.

31221331013021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123676.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 31221331013021 its reverse (12031013312213), we get a palindrome (43252344325234).

The spelling of 31221331013021 in words is "thirty-one trillion, two hundred twenty-one billion, three hundred thirty-one million, thirteen thousand, twenty-one".