21922690973 has 2 divisors, whose sum is σ = 21922690974. Its totient is φ = 21922690972.

The previous prime is 21922690927. The next prime is 21922691009. The reversal of 21922690973 is 37909622912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21444087844 + 478603129 = 146438^2 + 21877^2 .

It is a cyclic number.

It is not a de Polignac number, because 21922690973 - 2⁸ = 21922690717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21922690873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10961345486 + 10961345487.

It is an arithmetic number, because the mean of its divisors is an integer number (10961345487).

Almost surely, 2^21922690973 is an apocalyptic number.

It is an amenable number.

21922690973 is a deficient number, since it is larger than the sum of its proper divisors (1).

21922690973 is an equidigital number, since it uses as much as digits as its factorization.

21922690973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 50.

The spelling of 21922690973 in words is "twenty-one billion, nine hundred twenty-two million, six hundred ninety thousand, nine hundred seventy-three".