121792086821 has 2 divisors, whose sum is σ = 121792086822. Its totient is φ = 121792086820.

The previous prime is 121792086791. The next prime is 121792086833. The reversal of 121792086821 is 128680297121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117834292900 + 3957793921 = 343270^2 + 62911^2 .

It is a cyclic number.

It is not a de Polignac number, because 121792086821 - 2¹⁴ = 121792070437 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 (121792086121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60896043410 + 60896043411.

It is an arithmetic number, because the mean of its divisors is an integer number (60896043411).

Almost surely, 2^121792086821 is an apocalyptic number.

It is an amenable number.

121792086821 is a deficient number, since it is larger than the sum of its proper divisors (1).

121792086821 is an equidigital number, since it uses as much as digits as its factorization.

121792086821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 47.

The spelling of 121792086821 in words is "one hundred twenty-one billion, seven hundred ninety-two million, eighty-six thousand, eight hundred twenty-one".