12121157 has 2 divisors, whose sum is σ = 12121158. Its totient is φ = 12121156.

The previous prime is 12121147. The next prime is 12121211. The reversal of 12121157 is 75112121.

It is a happy number.

12121157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9541921 + 2579236 = 3089^2 + 1606^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12121157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12121147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060578 + 6060579.

It is an arithmetic number, because the mean of its divisors is an integer number (6060579).

Almost surely, 2^12121157 is an apocalyptic number.

It is an amenable number.

12121157 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121157 is an equidigital number, since it uses as much as digits as its factorization.

12121157 is an evil number, because the sum of its binary digits is even.

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

The square root of 12121157 is about 3481.5452029236. The cubic root of 12121157 is about 229.7107706566.

Adding to 12121157 its reverse (75112121), we get a palindrome (87233278).

The spelling of 12121157 in words is "twelve million, one hundred twenty-one thousand, one hundred fifty-seven".