31320023021013 has 16 divisors (see below), whose sum is σ = 42529952140416. Its totient is φ = 20497578958080.

The previous prime is 31320023020919. The next prime is 31320023021017. The reversal of 31320023021013 is 31012032002313.

It is not a de Polignac number, because 31320023021013 - 2¹³ = 31320023012821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320023021017) 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, 315491920 + ... + 315591177.

It is an arithmetic number, because the mean of its divisors is an integer number (2658122008776).

Almost surely, 2^{31320023021013} is an apocalyptic number.

It is an amenable number.

31320023021013 is a deficient number, since it is larger than the sum of its proper divisors (11209929119403).

31320023021013 is a wasteful number, since it uses less digits than its factorization.

31320023021013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631083404.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31320023021013 its reverse (31012032002313), we get a palindrome (62332055023326).

The spelling of 31320023021013 in words is "thirty-one trillion, three hundred twenty billion, twenty-three million, twenty-one thousand, thirteen".