121216157 has 2 divisors, whose sum is σ = 121216158. Its totient is φ = 121216156.

The previous prime is 121216129. The next prime is 121216177. The reversal of 121216157 is 751612121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116402521 + 4813636 = 10789^2 + 2194^2 .

It is a cyclic number.

It is not a de Polignac number, because 121216157 - 2¹⁴ = 121199773 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121216177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60608078 + 60608079.

It is an arithmetic number, because the mean of its divisors is an integer number (60608079).

Almost surely, 2^121216157 is an apocalyptic number.

It is an amenable number.

121216157 is a deficient number, since it is larger than the sum of its proper divisors (1).

121216157 is an equidigital number, since it uses as much as digits as its factorization.

121216157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 840, while the sum is 26.

The square root of 121216157 is about 11009.8209340570. The cubic root of 121216157 is about 494.9030956788.

Adding to 121216157 its reverse (751612121), we get a palindrome (872828278).

The spelling of 121216157 in words is "one hundred twenty-one million, two hundred sixteen thousand, one hundred fifty-seven".