21897063 has 12 divisors (see below), whose sum is σ = 33294040. Its totient is φ = 13829616.

The previous prime is 21897053. The next prime is 21897077. The reversal of 21897063 is 36079812.

It is not a de Polignac number, because 21897063 - 2⁶ = 21896999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21897053) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63856 + ... + 64197.

Almost surely, 2^21897063 is an apocalyptic number.

21897063 is a deficient number, since it is larger than the sum of its proper divisors (11396977).

21897063 is a wasteful number, since it uses less digits than its factorization.

21897063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128078 (or 128075 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 21897063 is about 4679.4297729531. The cubic root of 21897063 is about 279.7662291998.

The spelling of 21897063 in words is "twenty-one million, eight hundred ninety-seven thousand, sixty-three".