21246748 has 12 divisors (see below), whose sum is σ = 37219840. Its totient is φ = 10612512.

The previous prime is 21246721. The next prime is 21246751. The reversal of 21246748 is 84764212.

It is a happy number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3040 + ... + 7192.

Almost surely, 2^21246748 is an apocalyptic number.

It is an amenable number.

21246748 is a deficient number, since it is larger than the sum of its proper divisors (15973092).

21246748 is a wasteful number, since it uses less digits than its factorization.

21246748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5436 (or 5434 counting only the distinct ones).

The product of its digits is 21504, while the sum is 34.

The square root of 21246748 is about 4609.4194862260. The cubic root of 21246748 is about 276.9687827297.

The spelling of 21246748 in words is "twenty-one million, two hundred forty-six thousand, seven hundred forty-eight".