31122023321021 has 4 divisors (see below), whose sum is σ = 31963159086492. Its totient is φ = 30280887555552.

The previous prime is 31122023320981. The next prime is 31122023321027. The reversal of 31122023321021 is 12012332022113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28493283168100 + 2628740152921 = 5337910^2 + 1621339^2 .

It is a cyclic number.

It is not a de Polignac number, because 31122023321021 - 2²⁶ = 31121956212157 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 (31122023321027) 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, 420567882680 + ... + 420567882753.

It is an arithmetic number, because the mean of its divisors is an integer number (7990789771623).

Almost surely, 2^{31122023321021} is an apocalyptic number.

It is an amenable number.

31122023321021 is a deficient number, since it is larger than the sum of its proper divisors (841135765471).

31122023321021 is an equidigital number, since it uses as much as digits as its factorization.

31122023321021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 841135765470.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 31122023321021 its reverse (12012332022113), we get a palindrome (43134355343134).

The spelling of 31122023321021 in words is "thirty-one trillion, one hundred twenty-two billion, twenty-three million, three hundred twenty-one thousand, twenty-one".