21471168 has 28 divisors (see below), whose sum is σ = 56809640. Its totient is φ = 7156992.

The previous prime is 21471157. The next prime is 21471193. The reversal of 21471168 is 86117412.

It is a super-2 number, since 2×21471168² = 922022110568448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55723 + ... + 56106.

Almost surely, 2^21471168 is an apocalyptic number.

It is an amenable number.

21471168 is an abundant number, since it is smaller than the sum of its proper divisors (35338472).

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

21471168 is a wasteful number, since it uses less digits than its factorization.

21471168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111844 (or 111834 counting only the distinct ones).

The product of its digits is 2688, while the sum is 30.

The square root of 21471168 is about 4633.6991702095. The cubic root of 21471168 is about 277.9405355622.

The spelling of 21471168 in words is "twenty-one million, four hundred seventy-one thousand, one hundred sixty-eight".