121002157 has 2 divisors, whose sum is σ = 121002158. Its totient is φ = 121002156.

The previous prime is 121002121. The next prime is 121002169. The reversal of 121002157 is 751200121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120758121 + 244036 = 10989^2 + 494^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121002157 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 (121002257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60501078 + 60501079.

It is an arithmetic number, because the mean of its divisors is an integer number (60501079).

Almost surely, 2^121002157 is an apocalyptic number.

It is an amenable number.

121002157 is a deficient number, since it is larger than the sum of its proper divisors (1).

121002157 is an equidigital number, since it uses as much as digits as its factorization.

121002157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 121002157 is about 11000.0980450176. The cubic root of 121002157 is about 494.6116833461.

Adding to 121002157 its reverse (751200121), we get a palindrome (872202278).

The spelling of 121002157 in words is "one hundred twenty-one million, two thousand, one hundred fifty-seven".