21954432 has 32 divisors (see below), whose sum is σ = 58317480. Its totient is φ = 7318016.

The previous prime is 21954403. The next prime is 21954461. The reversal of 21954432 is 23445912.

It is an interprime number because it is at equal distance from previous prime (21954403) and next prime (21954461).

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 21954432.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28203 + ... + 28970.

Almost surely, 2^21954432 is an apocalyptic number.

It is an amenable number.

21954432 is an abundant number, since it is smaller than the sum of its proper divisors (36363048).

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

21954432 is an equidigital number, since it uses as much as digits as its factorization.

21954432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57190 (or 57178 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 21954432 is about 4685.5556767581. Note that the first 3 decimals coincide. The cubic root of 21954432 is about 280.0103397542.

The spelling of 21954432 in words is "twenty-one million, nine hundred fifty-four thousand, four hundred thirty-two".