22204021 has 4 divisors (see below), whose sum is σ = 25376032. Its totient is φ = 19032012.

The previous prime is 22204009. The next prime is 22204051. The reversal of 22204021 is 12040222.

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 22204021 - 2⁷ = 22203893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22203992 and 22204010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22204051) 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, 1585995 + ... + 1586008.

It is an arithmetic number, because the mean of its divisors is an integer number (6344008).

Almost surely, 2^22204021 is an apocalyptic number.

It is an amenable number.

22204021 is a deficient number, since it is larger than the sum of its proper divisors (3172011).

22204021 is an equidigital number, since it uses as much as digits as its factorization.

22204021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3172010.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 22204021 is about 4712.1142812967. The cubic root of 22204021 is about 281.0674432746.

Adding to 22204021 its reverse (12040222), we get a palindrome (34244243).

It can be divided in two parts, 2220 and 4021, that added together give a square (6241 = 79²).

The spelling of 22204021 in words is "twenty-two million, two hundred four thousand, twenty-one".