31320313213021 has 64 divisors (see below), whose sum is σ = 39127478353920. Its totient is φ = 24491287941120.

The previous prime is 31320313213009. The next prime is 31320313213027. The reversal of 31320313213021 is 12031231302313.

It is not a de Polignac number, because 31320313213021 - 2⁵ = 31320313212989 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 (31320313213027) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 744938026 + ... + 744980068.

It is an arithmetic number, because the mean of its divisors is an integer number (611366849280).

Almost surely, 2^{31320313213021} is an apocalyptic number.

31320313213021 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31320313213021 is a deficient number, since it is larger than the sum of its proper divisors (7807165140899).

31320313213021 is a wasteful number, since it uses less digits than its factorization.

31320313213021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44906.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 31320313213021 its reverse (12031231302313), we get a palindrome (43351544515334).

The spelling of 31320313213021 in words is "thirty-one trillion, three hundred twenty billion, three hundred thirteen million, two hundred thirteen thousand, twenty-one".