21246924 has 24 divisors (see below), whose sum is σ = 49654528. Its totient is φ = 7071120.

The previous prime is 21246913. The next prime is 21246931. The reversal of 21246924 is 42964212.

It is a junction number, because it is equal to n+sod(n) for n = 21246891 and 21246900.

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 7 ways as a sum of consecutive naturals, for example, 10689 + ... + 12519.

Almost surely, 2^21246924 is an apocalyptic number.

It is an amenable number.

21246924 is an abundant number, since it is smaller than the sum of its proper divisors (28407604).

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

21246924 is a wasteful number, since it uses less digits than its factorization.

21246924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2805 (or 2803 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 21246924 is about 4609.4385775276. The cubic root of 21246924 is about 276.9695474957.

The spelling of 21246924 in words is "twenty-one million, two hundred forty-six thousand, nine hundred twenty-four".