121765425251 has 2 divisors, whose sum is σ = 121765425252. Its totient is φ = 121765425250.

The previous prime is 121765425211. The next prime is 121765425259. The reversal of 121765425251 is 152524567121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121765425251 - 2¹⁰ = 121765424227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121765425199 and 121765425208.

It is not a weakly prime, because it can be changed into another prime (121765425259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60882712625 + 60882712626.

It is an arithmetic number, because the mean of its divisors is an integer number (60882712626).

Almost surely, 2^121765425251 is an apocalyptic number.

121765425251 is a deficient number, since it is larger than the sum of its proper divisors (1).

121765425251 is an equidigital number, since it uses as much as digits as its factorization.

121765425251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168000, while the sum is 41.

The spelling of 121765425251 in words is "one hundred twenty-one billion, seven hundred sixty-five million, four hundred twenty-five thousand, two hundred fifty-one".