121154111257 has 2 divisors, whose sum is σ = 121154111258. Its totient is φ = 121154111256.

The previous prime is 121154111233. The next prime is 121154111279. The reversal of 121154111257 is 752111451121.

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., 120588813081 + 565298176 = 347259^2 + 23776^2 .

It is a cyclic number.

It is not a de Polignac number, because 121154111257 - 2¹⁹ = 121153586969 is a prime.

It is not a weakly prime, because it can be changed into another prime (121154111297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60577055628 + 60577055629.

It is an arithmetic number, because the mean of its divisors is an integer number (60577055629).

Almost surely, 2^121154111257 is an apocalyptic number.

It is an amenable number.

121154111257 is a deficient number, since it is larger than the sum of its proper divisors (1).

121154111257 is an equidigital number, since it uses as much as digits as its factorization.

121154111257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2800, while the sum is 31.

Adding to 121154111257 its reverse (752111451121), we get a palindrome (873265562378).

The spelling of 121154111257 in words is "one hundred twenty-one billion, one hundred fifty-four million, one hundred eleven thousand, two hundred fifty-seven".