22031312321 has 4 divisors (see below), whose sum is σ = 22568661444. Its totient is φ = 21493963200.

The previous prime is 22031312293. The next prime is 22031312341. The reversal of 22031312321 is 12321313022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12321313022 = 2 ⋅6160656511.

It can be written as a sum of positive squares in 2 ways, for example, as 8929305025 + 13102007296 = 94495^2 + 114464^2 .

It is a cyclic number.

It is not a de Polignac number, because 22031312321 - 2²² = 22027118017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22031312293 and 22031312302.

It is not an unprimeable number, because it can be changed into a prime (22031312341) 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, 268674500 + ... + 268674581.

It is an arithmetic number, because the mean of its divisors is an integer number (5642165361).

Almost surely, 2^22031312321 is an apocalyptic number.

It is an amenable number.

22031312321 is a deficient number, since it is larger than the sum of its proper divisors (537349123).

22031312321 is an equidigital number, since it uses as much as digits as its factorization.

22031312321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537349122.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 22031312321 its reverse (12321313022), we get a palindrome (34352625343).

The spelling of 22031312321 in words is "twenty-two billion, thirty-one million, three hundred twelve thousand, three hundred twenty-one".