22431021 has 4 divisors (see below), whose sum is σ = 29908032. Its totient is φ = 14954012.

The previous prime is 22430987. The next prime is 22431047. The reversal of 22431021 is 12013422.

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 a cyclic number.

It is not a de Polignac number, because 22431021 - 2⁷ = 22430893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22431821) 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, 3738501 + ... + 3738506.

It is an arithmetic number, because the mean of its divisors is an integer number (7477008).

Almost surely, 2^22431021 is an apocalyptic number.

It is an amenable number.

22431021 is a deficient number, since it is larger than the sum of its proper divisors (7477011).

22431021 is an equidigital number, since it uses as much as digits as its factorization.

22431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7477010.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 22431021 is about 4736.1398839139. The cubic root of 22431021 is about 282.0220167912.

Adding to 22431021 its reverse (12013422), we get a palindrome (34444443).

The spelling of 22431021 in words is "twenty-two million, four hundred thirty-one thousand, twenty-one".