121761560251 has 2 divisors, whose sum is σ = 121761560252. Its totient is φ = 121761560250.

The previous prime is 121761560243. The next prime is 121761560269. The reversal of 121761560251 is 152065167121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121761560251 - 2³ = 121761560243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121761560251.

It is not a weakly prime, because it can be changed into another prime (121761560201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60880780125 + 60880780126.

It is an arithmetic number, because the mean of its divisors is an integer number (60880780126).

Almost surely, 2^121761560251 is an apocalyptic number.

121761560251 is a deficient number, since it is larger than the sum of its proper divisors (1).

121761560251 is an equidigital number, since it uses as much as digits as its factorization.

121761560251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25200, while the sum is 37.

The spelling of 121761560251 in words is "one hundred twenty-one billion, seven hundred sixty-one million, five hundred sixty thousand, two hundred fifty-one".