21838698 has 48 divisors (see below), whose sum is σ = 54340416. Its totient is φ = 6209280.

The previous prime is 21838679. The next prime is 21838723. The reversal of 21838698 is 89683812.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44233 + ... + 44723.

It is an arithmetic number, because the mean of its divisors is an integer number (1132092).

Almost surely, 2^21838698 is an apocalyptic number.

21838698 is an abundant number, since it is smaller than the sum of its proper divisors (32501718).

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

21838698 is a wasteful number, since it uses less digits than its factorization.

21838698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859 (or 856 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 21838698 is about 4673.1892750027. The cubic root of 21838698 is about 279.5174426387.

The spelling of 21838698 in words is "twenty-one million, eight hundred thirty-eight thousand, six hundred ninety-eight".