21914870 has 24 divisors (see below), whose sum is σ = 41909184. Its totient is φ = 8249216.

The previous prime is 21914857. The next prime is 21914891. The reversal of 21914870 is 7841912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 902 + ... + 6681.

It is an arithmetic number, because the mean of its divisors is an integer number (1746216).

Almost surely, 2^21914870 is an apocalyptic number.

21914870 is a deficient number, since it is larger than the sum of its proper divisors (19994314).

21914870 is a wasteful number, since it uses less digits than its factorization.

21914870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7624 (or 7607 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 21914870 is about 4681.3320753820. The cubic root of 21914870 is about 279.8420452644.

The spelling of 21914870 in words is "twenty-one million, nine hundred fourteen thousand, eight hundred seventy".