21625798 has 8 divisors (see below), whose sum is σ = 32481792. Its totient is φ = 10798536.

The previous prime is 21625787. The next prime is 21625811. The reversal of 21625798 is 89752612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21625798.

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, 5190 + ... + 8377.

It is an arithmetic number, because the mean of its divisors is an integer number (4060224).

Almost surely, 2^21625798 is an apocalyptic number.

21625798 is a deficient number, since it is larger than the sum of its proper divisors (10855994).

21625798 is a wasteful number, since it uses less digits than its factorization.

21625798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14366.

The product of its digits is 60480, while the sum is 40.

The square root of 21625798 is about 4650.3546101346. The cubic root of 21625798 is about 278.6061597096.

The spelling of 21625798 in words is "twenty-one million, six hundred twenty-five thousand, seven hundred ninety-eight".