21701968 has 20 divisors (see below), whose sum is σ = 42943680. Its totient is φ = 10619744.

The previous prime is 21701959. The next prime is 21701987. The reversal of 21701968 is 86910712.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13678 + ... + 15181.

It is an arithmetic number, because the mean of its divisors is an integer number (2147184).

Almost surely, 2^21701968 is an apocalyptic number.

It is an amenable number.

21701968 is a deficient number, since it is larger than the sum of its proper divisors (21241712).

21701968 is a wasteful number, since it uses less digits than its factorization.

21701968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28914 (or 28908 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 21701968 is about 4658.5371094368. The cubic root of 21701968 is about 278.9328769723.

The spelling of 21701968 in words is "twenty-one million, seven hundred one thousand, nine hundred sixty-eight".