121342157 has 2 divisors, whose sum is σ = 121342158. Its totient is φ = 121342156.

The previous prime is 121342139. The next prime is 121342171. The reversal of 121342157 is 751243121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115047076 + 6295081 = 10726^2 + 2509^2 .

It is a cyclic number.

It is not a de Polignac number, because 121342157 - 2⁶ = 121342093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121342127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60671078 + 60671079.

It is an arithmetic number, because the mean of its divisors is an integer number (60671079).

Almost surely, 2^121342157 is an apocalyptic number.

It is an amenable number.

121342157 is a deficient number, since it is larger than the sum of its proper divisors (1).

121342157 is an equidigital number, since it uses as much as digits as its factorization.

121342157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 26.

The square root of 121342157 is about 11015.5416117411. The cubic root of 121342157 is about 495.0745145111.

Adding to 121342157 its reverse (751243121), we get a palindrome (872585278).

The spelling of 121342157 in words is "one hundred twenty-one million, three hundred forty-two thousand, one hundred fifty-seven".