21954408 has 32 divisors (see below), whose sum is σ = 62727360. Its totient is φ = 6272640.

The previous prime is 21954403. The next prime is 21954461. The reversal of 21954408 is 80445912.

It is not an unprimeable number, because it can be changed into a prime (21954403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65173 + ... + 65508.

It is an arithmetic number, because the mean of its divisors is an integer number (1960230).

Almost surely, 2^21954408 is an apocalyptic number.

21954408 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21954408 is an abundant number, since it is smaller than the sum of its proper divisors (40772952).

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

21954408 is a wasteful number, since it uses less digits than its factorization.

21954408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130697 (or 130693 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 21954408 is about 4685.5531156951. The cubic root of 21954408 is about 280.0102377209.

The spelling of 21954408 in words is "twenty-one million, nine hundred fifty-four thousand, four hundred eight".