22163621 has 4 divisors (see below), whose sum is σ = 22203552. Its totient is φ = 22123692.

The previous prime is 22163611. The next prime is 22163623. The reversal of 22163621 is 12636122.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12636122 = 2 ⋅6318061.

It is a cyclic number.

It is not a de Polignac number, because 22163621 - 2²² = 17969317 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 (22163623) 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, 19121 + ... + 20246.

It is an arithmetic number, because the mean of its divisors is an integer number (5550888).

Almost surely, 2^22163621 is an apocalyptic number.

It is an amenable number.

22163621 is a deficient number, since it is larger than the sum of its proper divisors (39931).

22163621 is an equidigital number, since it uses as much as digits as its factorization.

22163621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39930.

The product of its digits is 864, while the sum is 23.

The square root of 22163621 is about 4707.8255065370. The cubic root of 22163621 is about 280.8968732906.

Adding to 22163621 its reverse (12636122), we get a palindrome (34799743).

The spelling of 22163621 in words is "twenty-two million, one hundred sixty-three thousand, six hundred twenty-one".