121207257 has 6 divisors (see below), whose sum is σ = 175077162. Its totient is φ = 80804832.

The previous prime is 121207253. The next prime is 121207267. The reversal of 121207257 is 752702121.

It can be written as a sum of positive squares in only one way, i.e., 77369616 + 43837641 = 8796^2 + 6621^2 .

It is not a de Polignac number, because 121207257 - 2² = 121207253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121207257.

It is not an unprimeable number, because it can be changed into a prime (121207253) 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 in 5 ways as a sum of consecutive naturals, for example, 6733728 + ... + 6733745.

It is an arithmetic number, because the mean of its divisors is an integer number (29179527).

Almost surely, 2^121207257 is an apocalyptic number.

It is an amenable number.

121207257 is a deficient number, since it is larger than the sum of its proper divisors (53869905).

121207257 is a wasteful number, since it uses less digits than its factorization.

121207257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13467479 (or 13467476 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

The square root of 121207257 is about 11009.4167420441. The cubic root of 121207257 is about 494.8909830324.

Adding to 121207257 its reverse (752702121), we get a palindrome (873909378).

The spelling of 121207257 in words is "one hundred twenty-one million, two hundred seven thousand, two hundred fifty-seven".