21465882 has 12 divisors (see below), whose sum is σ = 46509450. Its totient is φ = 7155288.

The previous prime is 21465881. The next prime is 21465907. The reversal of 21465882 is 28856412.

It can be written as a sum of positive squares in only one way, i.e., 16088121 + 5377761 = 4011^2 + 2319^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21465881) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 596257 + ... + 596292.

Almost surely, 2^21465882 is an apocalyptic number.

21465882 is an abundant number, since it is smaller than the sum of its proper divisors (25043568).

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

21465882 is a wasteful number, since it uses less digits than its factorization.

21465882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1192557 (or 1192554 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 21465882 is about 4633.1287484809. The cubic root of 21465882 is about 277.9177249066.

The spelling of 21465882 in words is "twenty-one million, four hundred sixty-five thousand, eight hundred eighty-two".