121200121157 has 2 divisors, whose sum is σ = 121200121158. Its totient is φ = 121200121156.

The previous prime is 121200121151. The next prime is 121200121219. The reversal of 121200121157 is 751121002121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117069359716 + 4130761441 = 342154^2 + 64271^2 .

It is a cyclic number.

It is not a de Polignac number, because 121200121157 - 2¹⁰ = 121200120133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121200121151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60600060578 + 60600060579.

It is an arithmetic number, because the mean of its divisors is an integer number (60600060579).

Almost surely, 2^121200121157 is an apocalyptic number.

It is an amenable number.

121200121157 is a deficient number, since it is larger than the sum of its proper divisors (1).

121200121157 is an equidigital number, since it uses as much as digits as its factorization.

121200121157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 23.

Adding to 121200121157 its reverse (751121002121), we get a palindrome (872321123278).

The spelling of 121200121157 in words is "one hundred twenty-one billion, two hundred million, one hundred twenty-one thousand, one hundred fifty-seven".