21954464 has 24 divisors (see below), whose sum is σ = 49398048. Its totient is φ = 9408960.

The previous prime is 21954461. The next prime is 21954487. The reversal of 21954464 is 46445912.

It is not an unprimeable number, because it can be changed into a prime (21954461) 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, 48782 + ... + 49229.

It is an arithmetic number, because the mean of its divisors is an integer number (2058252).

Almost surely, 2^21954464 is an apocalyptic number.

It is an amenable number.

21954464 is an abundant number, since it is smaller than the sum of its proper divisors (27443584).

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

21954464 is an equidigital number, since it uses as much as digits as its factorization.

21954464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98028 (or 98020 counting only the distinct ones).

The product of its digits is 34560, while the sum is 35.

The square root of 21954464 is about 4685.5590915066. The cubic root of 21954464 is about 280.0104757985.

The spelling of 21954464 in words is "twenty-one million, nine hundred fifty-four thousand, four hundred sixty-four".