121211212012157 has 2 divisors, whose sum is σ = 121211212012158. Its totient is φ = 121211212012156.

The previous prime is 121211212012153. The next prime is 121211212012183. The reversal of 121211212012157 is 751210212112121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116037470540761 + 5173741471396 = 10772069^2 + 2274586^2 .

It is a cyclic number.

It is not a de Polignac number, because 121211212012157 - 2² = 121211212012153 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121211212012153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605606006078 + 60605606006079.

It is an arithmetic number, because the mean of its divisors is an integer number (60605606006079).

Almost surely, 2^{121211212012157} is an apocalyptic number.

It is an amenable number.

121211212012157 is a deficient number, since it is larger than the sum of its proper divisors (1).

121211212012157 is an equidigital number, since it uses as much as digits as its factorization.

121211212012157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 29.

Adding to 121211212012157 its reverse (751210212112121), we get a palindrome (872421424124278).

The spelling of 121211212012157 in words is "one hundred twenty-one trillion, two hundred eleven billion, two hundred twelve million, twelve thousand, one hundred fifty-seven".