21217068 has 36 divisors (see below), whose sum is σ = 54134080. Its totient is φ = 7006176.

The previous prime is 21217039. The next prime is 21217087. The reversal of 21217068 is 86071212.

It is a tau number, because it is divible by the number of its divisors (36).

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, 1221 + ... + 6627.

Almost surely, 2^21217068 is an apocalyptic number.

It is an amenable number.

21217068 is an abundant number, since it is smaller than the sum of its proper divisors (32917012).

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

21217068 is a wasteful number, since it uses less digits than its factorization.

21217068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5526 (or 5521 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 21217068 is about 4606.1988667447. The cubic root of 21217068 is about 276.8397549179.

The spelling of 21217068 in words is "twenty-one million, two hundred seventeen thousand, sixty-eight".