21922766 has 16 divisors (see below), whose sum is σ = 34076160. Its totient is φ = 10566840.

The previous prime is 21922763. The next prime is 21922781. The reversal of 21922766 is 66722912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21922763) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 21005 + ... + 22023.

It is an arithmetic number, because the mean of its divisors is an integer number (2129760).

Almost surely, 2^21922766 is an apocalyptic number.

21922766 is a deficient number, since it is larger than the sum of its proper divisors (12153394).

21922766 is a wasteful number, since it uses less digits than its factorization.

21922766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1399.

The product of its digits is 18144, while the sum is 35.

The square root of 21922766 is about 4682.1753491299. The cubic root of 21922766 is about 279.8756505663.

The spelling of 21922766 in words is "twenty-one million, nine hundred twenty-two thousand, seven hundred sixty-six".