121008657 has 16 divisors (see below), whose sum is σ = 201157632. Its totient is φ = 62861520.

The previous prime is 121008653. The next prime is 121008683. The reversal of 121008657 is 756800121.

It is not a de Polignac number, because 121008657 - 2² = 121008653 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121008653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261693 + ... + 262154.

It is an arithmetic number, because the mean of its divisors is an integer number (12572352).

Almost surely, 2^121008657 is an apocalyptic number.

It is an amenable number.

121008657 is a deficient number, since it is larger than the sum of its proper divisors (80148975).

121008657 is a wasteful number, since it uses less digits than its factorization.

121008657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523868.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 121008657 is about 11000.3934929620. The cubic root of 121008657 is about 494.6205397127.

Adding to 121008657 its reverse (756800121), we get a palindrome (877808778).

The spelling of 121008657 in words is "one hundred twenty-one million, eight thousand, six hundred fifty-seven".