21954612 has 12 divisors (see below), whose sum is σ = 51227456. Its totient is φ = 7318200.

The previous prime is 21954607. The next prime is 21954613. The reversal of 21954612 is 21645912.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 21954612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21954613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 914764 + ... + 914787.

Almost surely, 2^21954612 is an apocalyptic number.

It is an amenable number.

21954612 is an abundant number, since it is smaller than the sum of its proper divisors (29272844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21954612 is a wasteful number, since it uses less digits than its factorization.

21954612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829558 (or 1829556 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 21954612 is about 4685.5748846860. The cubic root of 21954612 is about 280.0111050017.

The spelling of 21954612 in words is "twenty-one million, nine hundred fifty-four thousand, six hundred twelve".