21922669 has 2 divisors, whose sum is σ = 21922670. Its totient is φ = 21922668.

The previous prime is 21922661. The next prime is 21922687. The reversal of 21922669 is 96622912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12075625 + 9847044 = 3475^2 + 3138^2 .

It is a cyclic number.

It is not a de Polignac number, because 21922669 - 2³ = 21922661 is a prime.

It is a super-2 number, since 2×21922669² = 961206832167122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21922661) 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, 10961334 + 10961335.

It is an arithmetic number, because the mean of its divisors is an integer number (10961335).

Almost surely, 2^21922669 is an apocalyptic number.

It is an amenable number.

21922669 is a deficient number, since it is larger than the sum of its proper divisors (1).

21922669 is an equidigital number, since it uses as much as digits as its factorization.

21922669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 37.

The square root of 21922669 is about 4682.1649906854. The cubic root of 21922669 is about 279.8752377841.

The spelling of 21922669 in words is "twenty-one million, nine hundred twenty-two thousand, six hundred sixty-nine".