121701356809 has 2 divisors, whose sum is σ = 121701356810. Its totient is φ = 121701356808.

The previous prime is 121701356767. The next prime is 121701356827. The reversal of 121701356809 is 908653107121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120688844409 + 1012512400 = 347403^2 + 31820^2 .

It is a cyclic number.

It is not a de Polignac number, because 121701356809 - 2¹⁹ = 121700832521 is a prime.

It is a super-2 number, since 2×121701356809² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121701356879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60850678404 + 60850678405.

It is an arithmetic number, because the mean of its divisors is an integer number (60850678405).

Almost surely, 2^121701356809 is an apocalyptic number.

It is an amenable number.

121701356809 is a deficient number, since it is larger than the sum of its proper divisors (1).

121701356809 is an equidigital number, since it uses as much as digits as its factorization.

121701356809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 43.

The spelling of 121701356809 in words is "one hundred twenty-one billion, seven hundred one million, three hundred fifty-six thousand, eight hundred nine".