21922559 has 2 divisors, whose sum is σ = 21922560. Its totient is φ = 21922558.

The previous prime is 21922531. The next prime is 21922573. The reversal of 21922559 is 95522912.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21922559 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21922529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10961279 + 10961280.

It is an arithmetic number, because the mean of its divisors is an integer number (10961280).

Almost surely, 2^21922559 is an apocalyptic number.

21922559 is a deficient number, since it is larger than the sum of its proper divisors (1).

21922559 is an equidigital number, since it uses as much as digits as its factorization.

21922559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 35.

The square root of 21922559 is about 4682.1532439680. The cubic root of 21922559 is about 279.8747696792.

The spelling of 21922559 in words is "twenty-one million, nine hundred twenty-two thousand, five hundred fifty-nine".