121397759999 has 2 divisors, whose sum is σ = 121397760000. Its totient is φ = 121397759998.

The previous prime is 121397759947. The next prime is 121397760007. The reversal of 121397759999 is 999957793121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121397759999 - 2¹⁶ = 121397694463 is a prime.

It is a super-2 number, since 2×121397759999² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121397759939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60698879999 + 60698880000.

It is an arithmetic number, because the mean of its divisors is an integer number (60698880000).

Almost surely, 2^121397759999 is an apocalyptic number.

121397759999 is a deficient number, since it is larger than the sum of its proper divisors (1).

121397759999 is an equidigital number, since it uses as much as digits as its factorization.

121397759999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86802030, while the sum is 71.

The spelling of 121397759999 in words is "one hundred twenty-one billion, three hundred ninety-seven million, seven hundred fifty-nine thousand, nine hundred ninety-nine".