21972446 has 8 divisors (see below), whose sum is σ = 32979744. Its totient is φ = 10979200.

The previous prime is 21972439. The next prime is 21972451. The reversal of 21972446 is 64427912.

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

It is a Curzon number.

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, 2366 + ... + 7038.

It is an arithmetic number, because the mean of its divisors is an integer number (4122468).

Almost surely, 2^21972446 is an apocalyptic number.

21972446 is a deficient number, since it is larger than the sum of its proper divisors (11007298).

21972446 is a wasteful number, since it uses less digits than its factorization.

21972446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7026.

The product of its digits is 24192, while the sum is 35.

The square root of 21972446 is about 4687.4775732797. The cubic root of 21972446 is about 280.0869032972.

The spelling of 21972446 in words is "twenty-one million, nine hundred seventy-two thousand, four hundred forty-six".