21922573 has 2 divisors, whose sum is σ = 21922574. Its totient is φ = 21922572.

The previous prime is 21922559. The next prime is 21922583. The reversal of 21922573 is 37522912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14884164 + 7038409 = 3858^2 + 2653^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21922573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21922513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10961286 + 10961287.

It is an arithmetic number, because the mean of its divisors is an integer number (10961287).

Almost surely, 2^21922573 is an apocalyptic number.

It is an amenable number.

21922573 is a deficient number, since it is larger than the sum of its proper divisors (1).

21922573 is an equidigital number, since it uses as much as digits as its factorization.

21922573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 31.

The square root of 21922573 is about 4682.1547390064. The cubic root of 21922573 is about 279.8748292563.

The spelling of 21922573 in words is "twenty-one million, nine hundred twenty-two thousand, five hundred seventy-three".