121570771961 has 2 divisors, whose sum is σ = 121570771962. Its totient is φ = 121570771960.

The previous prime is 121570771937. The next prime is 121570771999. The reversal of 121570771961 is 169177075121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121561006336 + 9765625 = 348656^2 + 3125^2 .

It is an emirp because it is prime and its reverse (169177075121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121570771961 - 2¹⁴ = 121570755577 is a prime.

It is not a weakly prime, because it can be changed into another prime (121570771921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60785385980 + 60785385981.

It is an arithmetic number, because the mean of its divisors is an integer number (60785385981).

Almost surely, 2^121570771961 is an apocalyptic number.

It is an amenable number.

121570771961 is a deficient number, since it is larger than the sum of its proper divisors (1).

121570771961 is an equidigital number, since it uses as much as digits as its factorization.

121570771961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 185220, while the sum is 47.

The spelling of 121570771961 in words is "one hundred twenty-one billion, five hundred seventy million, seven hundred seventy-one thousand, nine hundred sixty-one".