21798268 has 6 divisors (see below), whose sum is σ = 38146976. Its totient is φ = 10899132.

The previous prime is 21798251. The next prime is 21798277. The reversal of 21798268 is 86289712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2724780 + ... + 2724787.

Almost surely, 2^21798268 is an apocalyptic number.

It is an amenable number.

21798268 is a deficient number, since it is larger than the sum of its proper divisors (16348708).

21798268 is a wasteful number, since it uses less digits than its factorization.

21798268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5449571 (or 5449569 counting only the distinct ones).

The product of its digits is 96768, while the sum is 43.

The square root of 21798268 is about 4668.8615314657. The cubic root of 21798268 is about 279.3448457929.

The spelling of 21798268 in words is "twenty-one million, seven hundred ninety-eight thousand, two hundred sixty-eight".