21922279 has 2 divisors, whose sum is σ = 21922280. Its totient is φ = 21922278.

The previous prime is 21922261. The next prime is 21922319. The reversal of 21922279 is 97222912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21922279 - 2⁵ = 21922247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21922379) 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 as a sum of consecutive naturals, namely, 10961139 + 10961140.

It is an arithmetic number, because the mean of its divisors is an integer number (10961140).

Almost surely, 2^21922279 is an apocalyptic number.

21922279 is a deficient number, since it is larger than the sum of its proper divisors (1).

21922279 is an equidigital number, since it uses as much as digits as its factorization.

21922279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 34.

The square root of 21922279 is about 4682.1233430998. The cubic root of 21922279 is about 279.8735781324.

It can be divided in two parts, 21922 and 279, that added together give a square (22201 = 149²).

The spelling of 21922279 in words is "twenty-one million, nine hundred twenty-two thousand, two hundred seventy-nine".