22423230021 has 4 divisors (see below), whose sum is σ = 29897640032. Its totient is φ = 14948820012.

The previous prime is 22423230017. The next prime is 22423230043. The reversal of 22423230021 is 12003232422.

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 22423230021 - 2² = 22423230017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22423230021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22423230421) 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, 3737205001 + ... + 3737205006.

It is an arithmetic number, because the mean of its divisors is an integer number (7474410008).

Almost surely, 2^22423230021 is an apocalyptic number.

It is an amenable number.

22423230021 is a deficient number, since it is larger than the sum of its proper divisors (7474410011).

22423230021 is an equidigital number, since it uses as much as digits as its factorization.

22423230021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7474410010.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 22423230021 its reverse (12003232422), we get a palindrome (34426462443).

The spelling of 22423230021 in words is "twenty-two billion, four hundred twenty-three million, two hundred thirty thousand, twenty-one".