21914368 has 54 divisors (see below), whose sum is σ = 50913996. Its totient is φ = 9386496.

The previous prime is 21914359. The next prime is 21914369. The reversal of 21914368 is 86341912.

It is not an unprimeable number, because it can be changed into a prime (21914369) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11671 + ... + 13417.

Almost surely, 2^21914368 is an apocalyptic number.

21914368 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21914368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25456998).

21914368 is an abundant number, since it is smaller than the sum of its proper divisors (28999628).

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

21914368 is an equidigital number, since it uses as much as digits as its factorization.

21914368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1777 (or 1756 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 21914368 is about 4681.2784578574. The cubic root of 21914368 is about 279.8399084843.

The spelling of 21914368 in words is "twenty-one million, nine hundred fourteen thousand, three hundred sixty-eight".