22421997 has 24 divisors (see below), whose sum is σ = 36933624. Its totient is φ = 12985344.

The previous prime is 22421983. The next prime is 22422007. The reversal of 22421997 is 79912422.

It can be written as a sum of positive squares in 4 ways, for example, as 1022121 + 21399876 = 1011^2 + 4626^2 .

It is not a de Polignac number, because 22421997 - 2⁶ = 22421933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22421797) 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 23 ways as a sum of consecutive naturals, for example, 3648 + ... + 7625.

It is an arithmetic number, because the mean of its divisors is an integer number (1538901).

Almost surely, 2^22421997 is an apocalyptic number.

It is an amenable number.

22421997 is a deficient number, since it is larger than the sum of its proper divisors (14511627).

22421997 is a wasteful number, since it uses less digits than its factorization.

22421997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11309 (or 11306 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 22421997 is about 4735.1871135152. The cubic root of 22421997 is about 281.9841925650.

The spelling of 22421997 in words is "twenty-two million, four hundred twenty-one thousand, nine hundred ninety-seven".