21958016 has 32 divisors (see below), whose sum is σ = 46322280. Its totient is φ = 10332160.

The previous prime is 21958009. The next prime is 21958021. The reversal of 21958016 is 61085912.

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

It is a Harshad number since it is a multiple of its sum of digits (32).

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, 2870 + ... + 7221.

Almost surely, 2^21958016 is an apocalyptic number.

It is an amenable number.

21958016 is an abundant number, since it is smaller than the sum of its proper divisors (24364264).

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

21958016 is a wasteful number, since it uses less digits than its factorization.

21958016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10122 (or 10110 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 21958016 is about 4685.9381131210. The cubic root of 21958016 is about 280.0255758951.

The spelling of 21958016 in words is "twenty-one million, nine hundred fifty-eight thousand, sixteen".