21963320 has 32 divisors (see below), whose sum is σ = 52326000. Its totient is φ = 8268288.

The previous prime is 21963317. The next prime is 21963323. The reversal of 21963320 is 2336912.

It is an interprime number because it is at equal distance from previous prime (21963317) and next prime (21963323).

It is a self number, because there is not a number n which added to its sum of digits gives 21963320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21963323) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 15470 + ... + 16829.

Almost surely, 2^21963320 is an apocalyptic number.

21963320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21963320 is an abundant number, since it is smaller than the sum of its proper divisors (30362680).

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

21963320 is a wasteful number, since it uses less digits than its factorization.

21963320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32327 (or 32323 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 21963320 is about 4686.5040275241. The cubic root of 21963320 is about 280.0481209811.

The spelling of 21963320 in words is "twenty-one million, nine hundred sixty-three thousand, three hundred twenty".