21464885 has 8 divisors (see below), whose sum is σ = 27739320. Its totient is φ = 15850944.

The previous prime is 21464867. The next prime is 21464903. The reversal of 21464885 is 58846412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21464867) and next prime (21464903).

It can be written as a sum of positive squares in 4 ways, for example, as 3129361 + 18335524 = 1769^2 + 4282^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21464885 - 2²⁰ = 20416309 is a prime.

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 165050 + ... + 165179.

It is an arithmetic number, because the mean of its divisors is an integer number (3467415).

Almost surely, 2^21464885 is an apocalyptic number.

It is an amenable number.

21464885 is a deficient number, since it is larger than the sum of its proper divisors (6274435).

21464885 is a wasteful number, since it uses less digits than its factorization.

21464885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330247.

The product of its digits is 61440, while the sum is 38.

The square root of 21464885 is about 4633.0211525526. The cubic root of 21464885 is about 277.9134221366.

The spelling of 21464885 in words is "twenty-one million, four hundred sixty-four thousand, eight hundred eighty-five".