22478621 has 4 divisors (see below), whose sum is σ = 24522144. Its totient is φ = 20435100.

The previous prime is 22478611. The next prime is 22478629. The reversal of 22478621 is 12687422.

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 a de Polignac number, because none of the positive numbers 2^k-22478621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22478629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1021745 + ... + 1021766.

It is an arithmetic number, because the mean of its divisors is an integer number (6130536).

Almost surely, 2^22478621 is an apocalyptic number.

It is an amenable number.

22478621 is a deficient number, since it is larger than the sum of its proper divisors (2043523).

22478621 is a wasteful number, since it uses less digits than its factorization.

22478621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2043522.

The product of its digits is 10752, while the sum is 32.

The square root of 22478621 is about 4741.1624102112. The cubic root of 22478621 is about 282.2213651770.

The spelling of 22478621 in words is "twenty-two million, four hundred seventy-eight thousand, six hundred twenty-one".