21498716 has 12 divisors (see below), whose sum is σ = 37790088. Its totient is φ = 10701552.

The previous prime is 21498707. The next prime is 21498733. The reversal of 21498716 is 61789412.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21498716.

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, 10931 + ... + 12746.

It is an arithmetic number, because the mean of its divisors is an integer number (3149174).

Almost surely, 2^21498716 is an apocalyptic number.

It is an amenable number.

21498716 is a deficient number, since it is larger than the sum of its proper divisors (16291372).

21498716 is a wasteful number, since it uses less digits than its factorization.

21498716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23908 (or 23906 counting only the distinct ones).

The product of its digits is 24192, while the sum is 38.

The square root of 21498716 is about 4636.6707883998. The cubic root of 21498716 is about 278.0593527846.

The spelling of 21498716 in words is "twenty-one million, four hundred ninety-eight thousand, seven hundred sixteen".