121123194817 has 2 divisors, whose sum is σ = 121123194818. Its totient is φ = 121123194816.

The previous prime is 121123194809. The next prime is 121123194851. The reversal of 121123194817 is 718491321121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65441825856 + 55681368961 = 255816^2 + 235969^2 .

It is a cyclic number.

It is not a de Polignac number, because 121123194817 - 2³ = 121123194809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121123194817.

It is not a weakly prime, because it can be changed into another prime (121123194887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60561597408 + 60561597409.

It is an arithmetic number, because the mean of its divisors is an integer number (60561597409).

Almost surely, 2^121123194817 is an apocalyptic number.

It is an amenable number.

121123194817 is a deficient number, since it is larger than the sum of its proper divisors (1).

121123194817 is an equidigital number, since it uses as much as digits as its factorization.

121123194817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 40.

The spelling of 121123194817 in words is "one hundred twenty-one billion, one hundred twenty-three million, one hundred ninety-four thousand, eight hundred seventeen".