21958336 has 28 divisors (see below), whose sum is σ = 45079920. Its totient is φ = 10599680.

The previous prime is 21958303. The next prime is 21958361. The reversal of 21958336 is 63385912.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21958295 and 21958304.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4060 + ... + 7771.

Almost surely, 2^21958336 is an apocalyptic number.

It is an amenable number.

21958336 is an abundant number, since it is smaller than the sum of its proper divisors (23121584).

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

21958336 is a wasteful number, since it uses less digits than its factorization.

21958336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11872 (or 11862 counting only the distinct ones).

The product of its digits is 38880, while the sum is 37.

The square root of 21958336 is about 4685.9722577070. The cubic root of 21958336 is about 280.0269361841.

The spelling of 21958336 in words is "twenty-one million, nine hundred fifty-eight thousand, three hundred thirty-six".