121253745557 has 32 divisors (see below), whose sum is σ = 144088971264. Its totient is φ = 99847987200.

The previous prime is 121253745553. The next prime is 121253745559. The reversal of 121253745557 is 755547352121.

It is a cyclic number.

It is not a de Polignac number, because 121253745557 - 2² = 121253745553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121253745551) 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 in 31 ways as a sum of consecutive naturals, for example, 21817223 + ... + 21822779.

It is an arithmetic number, because the mean of its divisors is an integer number (4502780352).

Almost surely, 2^121253745557 is an apocalyptic number.

It is an amenable number.

121253745557 is a deficient number, since it is larger than the sum of its proper divisors (22835225707).

121253745557 is a wasteful number, since it uses less digits than its factorization.

121253745557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6309.

The product of its digits is 1470000, while the sum is 47.

The spelling of 121253745557 in words is "one hundred twenty-one billion, two hundred fifty-three million, seven hundred forty-five thousand, five hundred fifty-seven".