21886461 has 24 divisors (see below), whose sum is σ = 33540000. Its totient is φ = 13714272.

The previous prime is 21886451. The next prime is 21886471. The reversal of 21886461 is 16468812.

21886461 is a `hidden beast` number, since 2 + 1 + 8 + 8 + 646 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (21886451) and next prime (21886471).

It is not a de Polignac number, because 21886461 - 2¹¹ = 21884413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21886411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25050 + ... + 25908.

It is an arithmetic number, because the mean of its divisors is an integer number (1397500).

Almost surely, 2^21886461 is an apocalyptic number.

It is an amenable number.

21886461 is a deficient number, since it is larger than the sum of its proper divisors (11653539).

21886461 is a wasteful number, since it uses less digits than its factorization.

21886461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033 (or 1030 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 21886461 is about 4678.2968054624. The cubic root of 21886461 is about 279.7210700173.

It can be divided in two parts, 2188 and 6461, that added together give a square (8649 = 93²).

The spelling of 21886461 in words is "twenty-one million, eight hundred eighty-six thousand, four hundred sixty-one".