21912338 has 8 divisors (see below), whose sum is σ = 37564032. Its totient is φ = 9390996.

The previous prime is 21912311. The next prime is 21912347. The reversal of 21912338 is 83321912.

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 21912338.

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, 782570 + ... + 782597.

It is an arithmetic number, because the mean of its divisors is an integer number (4695504).

Almost surely, 2^21912338 is an apocalyptic number.

21912338 is a deficient number, since it is larger than the sum of its proper divisors (15651694).

21912338 is a wasteful number, since it uses less digits than its factorization.

21912338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565176.

The product of its digits is 2592, while the sum is 29.

The square root of 21912338 is about 4681.0616317242. The cubic root of 21912338 is about 279.8312673870.

The spelling of 21912338 in words is "twenty-one million, nine hundred twelve thousand, three hundred thirty-eight".