22404921 has 32 divisors (see below), whose sum is σ = 38873088. Its totient is φ = 11130240.

The previous prime is 22404919. The next prime is 22404979. The reversal of 22404921 is 12940422.

It is not a de Polignac number, because 22404921 - 2¹ = 22404919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22404891 and 22404900.

It is not an unprimeable number, because it can be changed into a prime (22404911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3205 + ... + 7421.

It is an arithmetic number, because the mean of its divisors is an integer number (1214784).

Almost surely, 2^22404921 is an apocalyptic number.

22404921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22404921 is a deficient number, since it is larger than the sum of its proper divisors (16468167).

22404921 is a wasteful number, since it uses less digits than its factorization.

22404921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4261.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 22404921 is about 4733.3836734412. The cubic root of 22404921 is about 281.9125904837.

The spelling of 22404921 in words is "twenty-two million, four hundred four thousand, nine hundred twenty-one".