21922478 has 8 divisors (see below), whose sum is σ = 33040200. Its totient is φ = 10909080.

The previous prime is 21922429. The next prime is 21922501. The reversal of 21922478 is 87422912.

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, 25553 + ... + 26396.

It is an arithmetic number, because the mean of its divisors is an integer number (4130025).

Almost surely, 2^21922478 is an apocalyptic number.

21922478 is a deficient number, since it is larger than the sum of its proper divisors (11117722).

21922478 is a wasteful number, since it uses less digits than its factorization.

21922478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52162.

The product of its digits is 16128, while the sum is 35.

The square root of 21922478 is about 4682.1445940936. The cubic root of 21922478 is about 279.8744249828.

The spelling of 21922478 in words is "twenty-one million, nine hundred twenty-two thousand, four hundred seventy-eight".