921770122909 has 2 divisors, whose sum is σ = 921770122910. Its totient is φ = 921770122908.

The previous prime is 921770122843. The next prime is 921770122919. The reversal of 921770122909 is 909221077129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 480807720409 + 440962402500 = 693403^2 + 664050^2 .

It is a cyclic number.

It is not a de Polignac number, because 921770122909 - 2⁹ = 921770122397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921770122919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460885061454 + 460885061455.

It is an arithmetic number, because the mean of its divisors is an integer number (460885061455).

Almost surely, 2^921770122909 is an apocalyptic number.

It is an amenable number.

921770122909 is a deficient number, since it is larger than the sum of its proper divisors (1).

921770122909 is an equidigital number, since it uses as much as digits as its factorization.

921770122909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 285768, while the sum is 49.

The spelling of 921770122909 in words is "nine hundred twenty-one billion, seven hundred seventy million, one hundred twenty-two thousand, nine hundred nine".