22421906 has 12 divisors (see below), whose sum is σ = 36419562. Its totient is φ = 10348416.

The previous prime is 22421891. The next prime is 22421911. The reversal of 22421906 is 60912422.

It can be written as a sum of positive squares in 3 ways, for example, as 11498881 + 10923025 = 3391^2 + 3305^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32831 + ... + 33506.

Almost surely, 2^22421906 is an apocalyptic number.

22421906 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

22421906 is a deficient number, since it is larger than the sum of its proper divisors (13997656).

22421906 is a wasteful number, since it uses less digits than its factorization.

22421906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66365 (or 66352 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 22421906 is about 4735.1775045926. The cubic root of 22421906 is about 281.9838110855.

The spelling of 22421906 in words is "twenty-two million, four hundred twenty-one thousand, nine hundred six".