31221022012213 has 4 divisors (see below), whose sum is σ = 34059296740608. Its totient is φ = 28382747283820.

The previous prime is 31221022012171. The next prime is 31221022012223.

31221022012213 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31221022012213 - 2²⁹ = 31220485141301 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 (31221022012223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1419137364181 + ... + 1419137364202.

It is an arithmetic number, because the mean of its divisors is an integer number (8514824185152).

Almost surely, 2^{31221022012213} is an apocalyptic number.

It is an amenable number.

31221022012213 is a deficient number, since it is larger than the sum of its proper divisors (2838274728395).

31221022012213 is a wasteful number, since it uses less digits than its factorization.

31221022012213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2838274728394.

The product of its (nonzero) digits is 576, while the sum is 22.

Multiplying 31221022012213 by its sum of digits (22), we get a palindrome (686862484268686).

It can be divided in two parts, 3122102 and 2012213, that added together give a palindrome (5134315).

The spelling of 31221022012213 in words is "thirty-one trillion, two hundred twenty-one billion, twenty-two million, twelve thousand, two hundred thirteen".