21930922 has 8 divisors (see below), whose sum is σ = 35426916. Its totient is φ = 10121952.

The previous prime is 21930917. The next prime is 21930991. The reversal of 21930922 is 22903912.

It can be written as a sum of positive squares in 2 ways, for example, as 17732521 + 4198401 = 4211^2 + 2049^2 .

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, 421723 + ... + 421774.

Almost surely, 2^21930922 is an apocalyptic number.

21930922 is a deficient number, since it is larger than the sum of its proper divisors (13495994).

21930922 is a wasteful number, since it uses less digits than its factorization.

21930922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843512.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 21930922 is about 4683.0462308203. The cubic root of 21930922 is about 279.9103539546.

The spelling of 21930922 in words is "twenty-one million, nine hundred thirty thousand, nine hundred twenty-two".