21922651 has 2 divisors, whose sum is σ = 21922652. Its totient is φ = 21922650.

The previous prime is 21922619. The next prime is 21922661. The reversal of 21922651 is 15622912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21922651 - 2⁵ = 21922619 is a prime.

It is a Chen prime.

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, 10961325 + 10961326.

It is an arithmetic number, because the mean of its divisors is an integer number (10961326).

Almost surely, 2^21922651 is an apocalyptic number.

21922651 is a deficient number, since it is larger than the sum of its proper divisors (1).

21922651 is an equidigital number, since it uses as much as digits as its factorization.

21922651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 28.

The square root of 21922651 is about 4682.1630684973. The cubic root of 21922651 is about 279.8751611853.

The spelling of 21922651 in words is "twenty-one million, nine hundred twenty-two thousand, six hundred fifty-one".