22031323221 has 4 divisors (see below), whose sum is σ = 29375097632. Its totient is φ = 14687548812.

The previous prime is 22031323183. The next prime is 22031323231. The reversal of 22031323221 is 12232313022.

It is a happy number.

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 not a de Polignac number, because 22031323221 - 2⁶ = 22031323157 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 (22031323231) 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, 3671887201 + ... + 3671887206.

It is an arithmetic number, because the mean of its divisors is an integer number (7343774408).

Almost surely, 2^22031323221 is an apocalyptic number.

It is an amenable number.

22031323221 is a deficient number, since it is larger than the sum of its proper divisors (7343774411).

22031323221 is an equidigital number, since it uses as much as digits as its factorization.

22031323221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7343774410.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 22031323221 its reverse (12232313022), we get a palindrome (34263636243).

The spelling of 22031323221 in words is "twenty-two billion, thirty-one million, three hundred twenty-three thousand, two hundred twenty-one".