102121157 has 2 divisors, whose sum is σ = 102121158. Its totient is φ = 102121156.

The previous prime is 102121141. The next prime is 102121163. The reversal of 102121157 is 751121201.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82283041 + 19838116 = 9071^2 + 4454^2 .

It is a cyclic number.

It is not a de Polignac number, because 102121157 - 2⁴ = 102121141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102141157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51060578 + 51060579.

It is an arithmetic number, because the mean of its divisors is an integer number (51060579).

Almost surely, 2^102121157 is an apocalyptic number.

It is an amenable number.

102121157 is a deficient number, since it is larger than the sum of its proper divisors (1).

102121157 is an equidigital number, since it uses as much as digits as its factorization.

102121157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 140, while the sum is 20.

The square root of 102121157 is about 10105.5013235366. The cubic root of 102121157 is about 467.4177948437.

Adding to 102121157 its reverse (751121201), we get a palindrome (853242358).

The spelling of 102121157 in words is "one hundred two million, one hundred twenty-one thousand, one hundred fifty-seven".