12121957 has 2 divisors, whose sum is σ = 12121958. Its totient is φ = 12121956.

The previous prime is 12121939. The next prime is 12121973. The reversal of 12121957 is 75912121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7568001 + 4553956 = 2751^2 + 2134^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121957 - 2¹⁹ = 11597669 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 (12121927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060978 + 6060979.

It is an arithmetic number, because the mean of its divisors is an integer number (6060979).

Almost surely, 2^12121957 is an apocalyptic number.

It is an amenable number.

12121957 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121957 is an equidigital number, since it uses as much as digits as its factorization.

12121957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 28.

The square root of 12121957 is about 3481.6600925421. The cubic root of 12121957 is about 229.7158242054.

The spelling of 12121957 in words is "twelve million, one hundred twenty-one thousand, nine hundred fifty-seven".