121123199257 has 2 divisors, whose sum is σ = 121123199258. Its totient is φ = 121123199256.

The previous prime is 121123199251. The next prime is 121123199261. The reversal of 121123199257 is 752991321121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112522677136 + 8600522121 = 335444^2 + 92739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121123199257 is a prime.

It is a super-3 number, since 3×121123199257³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (121123199251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60561599628 + 60561599629.

It is an arithmetic number, because the mean of its divisors is an integer number (60561599629).

Almost surely, 2^121123199257 is an apocalyptic number.

It is an amenable number.

121123199257 is a deficient number, since it is larger than the sum of its proper divisors (1).

121123199257 is an equidigital number, since it uses as much as digits as its factorization.

121123199257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 43.

The spelling of 121123199257 in words is "one hundred twenty-one billion, one hundred twenty-three million, one hundred ninety-nine thousand, two hundred fifty-seven".