121557107201 has 2 divisors, whose sum is σ = 121557107202. Its totient is φ = 121557107200.

The previous prime is 121557107197. The next prime is 121557107297. The reversal of 121557107201 is 102701755121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119549977600 + 2007129601 = 345760^2 + 44801^2 .

It is a cyclic number.

It is not a de Polignac number, because 121557107201 - 2² = 121557107197 is a prime.

It is a super-2 number, since 2×121557107201² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121557107401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60778553600 + 60778553601.

It is an arithmetic number, because the mean of its divisors is an integer number (60778553601).

Almost surely, 2^121557107201 is an apocalyptic number.

It is an amenable number.

121557107201 is a deficient number, since it is larger than the sum of its proper divisors (1).

121557107201 is an equidigital number, since it uses as much as digits as its factorization.

121557107201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4900, while the sum is 32.

The spelling of 121557107201 in words is "one hundred twenty-one billion, five hundred fifty-seven million, one hundred seven thousand, two hundred one".