21924398 has 8 divisors (see below), whose sum is σ = 32992608. Its totient is φ = 10926864.

The previous prime is 21924389. The next prime is 21924401. The reversal of 21924398 is 89342912.

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

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, 16886 + ... + 18137.

It is an arithmetic number, because the mean of its divisors is an integer number (4124076).

Almost surely, 2^21924398 is an apocalyptic number.

21924398 is a deficient number, since it is larger than the sum of its proper divisors (11068210).

21924398 is a wasteful number, since it uses less digits than its factorization.

21924398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35338.

The product of its digits is 31104, while the sum is 38.

The square root of 21924398 is about 4682.3496238534. The cubic root of 21924398 is about 279.8825953367.

It can be divided in two parts, 21924 and 398, that added together give a palindrome (22322).

The spelling of 21924398 in words is "twenty-one million, nine hundred twenty-four thousand, three hundred ninety-eight".