21924638 has 8 divisors (see below), whose sum is σ = 34021080. Its totient is φ = 10584280.

The previous prime is 21924629. The next prime is 21924647. The reversal of 21924638 is 83642912.

It is an interprime number because it is at equal distance from previous prime (21924629) and next prime (21924647).

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

It is a junction number, because it is equal to n+sod(n) for n = 21924598 and 21924607.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188948 + ... + 189063.

It is an arithmetic number, because the mean of its divisors is an integer number (4252635).

Almost surely, 2^21924638 is an apocalyptic number.

21924638 is a deficient number, since it is larger than the sum of its proper divisors (12096442).

21924638 is a wasteful number, since it uses less digits than its factorization.

21924638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378042.

The product of its digits is 20736, while the sum is 35.

The square root of 21924638 is about 4682.3752519421. The cubic root of 21924638 is about 279.8836165973.

The spelling of 21924638 in words is "twenty-one million, nine hundred twenty-four thousand, six hundred thirty-eight".