121333657 has 2 divisors, whose sum is σ = 121333658. Its totient is φ = 121333656.

The previous prime is 121333643. The next prime is 121333661. The reversal of 121333657 is 756333121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119705481 + 1628176 = 10941^2 + 1276^2 .

It is an emirp because it is prime and its reverse (756333121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121333657 is a prime.

It is not a weakly prime, because it can be changed into another prime (121333627) 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, 60666828 + 60666829.

It is an arithmetic number, because the mean of its divisors is an integer number (60666829).

Almost surely, 2^121333657 is an apocalyptic number.

It is an amenable number.

121333657 is a deficient number, since it is larger than the sum of its proper divisors (1).

121333657 is an equidigital number, since it uses as much as digits as its factorization.

121333657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 31.

The square root of 121333657 is about 11015.1557864608. The cubic root of 121333657 is about 495.0629542759.

Adding to 121333657 its reverse (756333121), we get a palindrome (877666778).

The spelling of 121333657 in words is "one hundred twenty-one million, three hundred thirty-three thousand, six hundred fifty-seven".