21424916 has 24 divisors (see below), whose sum is σ = 38290560. Its totient is φ = 10487232.

The previous prime is 21424877. The next prime is 21424943. The reversal of 21424916 is 61942412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69635 + ... + 69941.

It is an arithmetic number, because the mean of its divisors is an integer number (1595440).

Almost surely, 2^21424916 is an apocalyptic number.

It is an amenable number.

21424916 is a deficient number, since it is larger than the sum of its proper divisors (16865644).

21424916 is a wasteful number, since it uses less digits than its factorization.

21424916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623 (or 621 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 21424916 is about 4628.7056506112. The cubic root of 21424916 is about 277.7408173875.

The spelling of 21424916 in words is "twenty-one million, four hundred twenty-four thousand, nine hundred sixteen".