21893163 has 16 divisors (see below), whose sum is σ = 29690496. Its totient is φ = 14348160.

The previous prime is 21893153. The next prime is 21893167. The reversal of 21893163 is 36139812.

It is not a de Polignac number, because 21893163 - 2⁴ = 21893147 is a prime.

It is a super-2 number, since 2×21893163² = 958621172289138, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21893167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77220 + ... + 77502.

It is an arithmetic number, because the mean of its divisors is an integer number (1855656).

Almost surely, 2^21893163 is an apocalyptic number.

21893163 is a deficient number, since it is larger than the sum of its proper divisors (7797333).

21893163 is a wasteful number, since it uses less digits than its factorization.

21893163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634.

The product of its digits is 7776, while the sum is 33.

The square root of 21893163 is about 4679.0130369556. The cubic root of 21893163 is about 279.7496188584.

The spelling of 21893163 in words is "twenty-one million, eight hundred ninety-three thousand, one hundred sixty-three".