21922306 has 12 divisors (see below), whose sum is σ = 38252358. Its totient is φ = 9395232.

The previous prime is 21922279. The next prime is 21922319. The reversal of 21922306 is 60322912.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18533025 + 3389281 = 4305^2 + 1841^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 111751 + ... + 111946.

Almost surely, 2^21922306 is an apocalyptic number.

21922306 is a deficient number, since it is larger than the sum of its proper divisors (16330052).

21922306 is a wasteful number, since it uses less digits than its factorization.

21922306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223713 (or 223706 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 21922306 is about 4682.1262264061. The cubic root of 21922306 is about 279.8736930320.

The spelling of 21922306 in words is "twenty-one million, nine hundred twenty-two thousand, three hundred six".