21914880 has 144 divisors (see below), whose sum is σ = 75546240. Its totient is φ = 5382144.

The previous prime is 21914857. The next prime is 21914891. The reversal of 21914880 is 8841912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49701 + ... + 50139.

Almost surely, 2^21914880 is an apocalyptic number.

21914880 is a gapful number since it is divisible by the number (20) 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 21914880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37773120).

21914880 is an abundant number, since it is smaller than the sum of its proper divisors (53631360).

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

21914880 is a wasteful number, since it uses less digits than its factorization.

21914880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476 (or 462 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 21914880 is about 4681.3331434539. Note that the first 3 decimals coincide. The cubic root of 21914880 is about 279.8420878294.

The spelling of 21914880 in words is "twenty-one million, nine hundred fourteen thousand, eight hundred eighty".