121210157 has 2 divisors, whose sum is σ = 121210158. Its totient is φ = 121210156.

The previous prime is 121210081. The next prime is 121210181. The reversal of 121210157 is 751012121.

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., 113081956 + 8128201 = 10634^2 + 2851^2 .

It is a cyclic number.

It is not a de Polignac number, because 121210157 - 2¹⁴ = 121193773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121210657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605078 + 60605079.

It is an arithmetic number, because the mean of its divisors is an integer number (60605079).

Almost surely, 2^121210157 is an apocalyptic number.

It is an amenable number.

121210157 is a deficient number, since it is larger than the sum of its proper divisors (1).

121210157 is an equidigital number, since it uses as much as digits as its factorization.

121210157 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 121210157 is about 11009.5484466894. The cubic root of 121210157 is about 494.8949299149.

Adding to 121210157 its reverse (751012121), we get a palindrome (872222278).

The spelling of 121210157 in words is "one hundred twenty-one million, two hundred ten thousand, one hundred fifty-seven".