21224392 has 16 divisors (see below), whose sum is σ = 45480960. Its totient is φ = 9096144.

The previous prime is 21224389. The next prime is 21224431. The reversal of 21224392 is 29342212.

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 3 ways as a sum of consecutive naturals, for example, 189448 + ... + 189559.

It is an arithmetic number, because the mean of its divisors is an integer number (2842560).

Almost surely, 2^21224392 is an apocalyptic number.

It is an amenable number.

21224392 is an abundant number, since it is smaller than the sum of its proper divisors (24256568).

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

21224392 is a wasteful number, since it uses less digits than its factorization.

21224392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379020 (or 379016 counting only the distinct ones).

The product of its digits is 1728, while the sum is 25.

The square root of 21224392 is about 4606.9938137575. The cubic root of 21224392 is about 276.8716057075.

The spelling of 21224392 in words is "twenty-one million, two hundred twenty-four thousand, three hundred ninety-two".