22312021231 has 4 divisors (see below), whose sum is σ = 22376321352. Its totient is φ = 22247721112.

The previous prime is 22312021223. The next prime is 22312021267. The reversal of 22312021231 is 13212021322.

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

It is a cyclic number.

It is not a de Polignac number, because 22312021231 - 2³ = 22312021223 is a prime.

It is a super-3 number, since 3×22312021231³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22312021199 and 22312021208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22312021531) 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, 32149540 + ... + 32150233.

It is an arithmetic number, because the mean of its divisors is an integer number (5594080338).

Almost surely, 2^22312021231 is an apocalyptic number.

22312021231 is a deficient number, since it is larger than the sum of its proper divisors (64300121).

22312021231 is an equidigital number, since it uses as much as digits as its factorization.

22312021231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64300120.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 22312021231 its reverse (13212021322), we get a palindrome (35524042553).

Subtracting from 22312021231 its reverse (13212021322), we obtain a palindrome (9099999909).

The spelling of 22312021231 in words is "twenty-two billion, three hundred twelve million, twenty-one thousand, two hundred thirty-one".