21465992 has 16 divisors (see below), whose sum is σ = 41999040. Its totient is φ = 10266256.

The previous prime is 21465979. The next prime is 21466021. The reversal of 21465992 is 29956412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58148 + ... + 58515.

It is an arithmetic number, because the mean of its divisors is an integer number (2624940).

Almost surely, 2^21465992 is an apocalyptic number.

It is an amenable number.

21465992 is a deficient number, since it is larger than the sum of its proper divisors (20533048).

21465992 is a wasteful number, since it uses less digits than its factorization.

21465992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116692 (or 116688 counting only the distinct ones).

The product of its digits is 38880, while the sum is 38.

The square root of 21465992 is about 4633.1406194934. The cubic root of 21465992 is about 277.9181996274.

The spelling of 21465992 in words is "twenty-one million, four hundred sixty-five thousand, nine hundred ninety-two".