21938426 has 8 divisors (see below), whose sum is σ = 34639680. Its totient is φ = 10391868.

The previous prime is 21938417. The next prime is 21938437. The reversal of 21938426 is 62483912.

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

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, 288626 + ... + 288701.

It is an arithmetic number, because the mean of its divisors is an integer number (4329960).

Almost surely, 2^21938426 is an apocalyptic number.

21938426 is a deficient number, since it is larger than the sum of its proper divisors (12701254).

21938426 is a wasteful number, since it uses less digits than its factorization.

21938426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577348.

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

The square root of 21938426 is about 4683.8473502026. The cubic root of 21938426 is about 279.9422755154.

The spelling of 21938426 in words is "twenty-one million, nine hundred thirty-eight thousand, four hundred twenty-six".