121570772621 has 2 divisors, whose sum is σ = 121570772622. Its totient is φ = 121570772620.

The previous prime is 121570772579. The next prime is 121570772651. The reversal of 121570772621 is 126277075121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121570768900 + 3721 = 348670^2 + 61^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121570772621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121570772651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60785386310 + 60785386311.

It is an arithmetic number, because the mean of its divisors is an integer number (60785386311).

Almost surely, 2^121570772621 is an apocalyptic number.

It is an amenable number.

121570772621 is a deficient number, since it is larger than the sum of its proper divisors (1).

121570772621 is an equidigital number, since it uses as much as digits as its factorization.

121570772621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82320, while the sum is 41.

The spelling of 121570772621 in words is "one hundred twenty-one billion, five hundred seventy million, seven hundred seventy-two thousand, six hundred twenty-one".