22159421 has 4 divisors (see below), whose sum is σ = 22440000. Its totient is φ = 21878844.

The previous prime is 22159391. The next prime is 22159427. The reversal of 22159421 is 12495122.

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 22159421 - 2²² = 17965117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22159427) 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, 140171 + ... + 140328.

It is an arithmetic number, because the mean of its divisors is an integer number (5610000).

Almost surely, 2^22159421 is an apocalyptic number.

It is an amenable number.

22159421 is a deficient number, since it is larger than the sum of its proper divisors (280579).

22159421 is an equidigital number, since it uses as much as digits as its factorization.

22159421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280578.

The product of its digits is 1440, while the sum is 26.

The square root of 22159421 is about 4707.3794195922. The cubic root of 22159421 is about 280.8791288766.

The spelling of 22159421 in words is "twenty-two million, one hundred fifty-nine thousand, four hundred twenty-one".