22504021 has 4 divisors (see below), whose sum is σ = 22577632. Its totient is φ = 22430412.

The previous prime is 22503979. The next prime is 22504043. The reversal of 22504021 is 12040522.

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 22504021 - 2¹⁹ = 21979733 is a prime.

It is a super-2 number, since 2×22504021² = 1012861922336882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22503986 and 22504004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22504061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36345 + ... + 36958.

It is an arithmetic number, because the mean of its divisors is an integer number (5644408).

Almost surely, 2^22504021 is an apocalyptic number.

It is an amenable number.

22504021 is a deficient number, since it is larger than the sum of its proper divisors (73611).

22504021 is an equidigital number, since it uses as much as digits as its factorization.

22504021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73610.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 22504021 is about 4743.8403219333. The cubic root of 22504021 is about 282.3276250220.

Adding to 22504021 its reverse (12040522), we get a palindrome (34544543).

The spelling of 22504021 in words is "twenty-two million, five hundred four thousand, twenty-one".