121281668 has 12 divisors (see below), whose sum is σ = 221471040. Its totient is φ = 58004232.

The previous prime is 121281659. The next prime is 121281697. The reversal of 121281668 is 866182121.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 659048 + ... + 659231.

It is an arithmetic number, because the mean of its divisors is an integer number (18455920).

Almost surely, 2^121281668 is an apocalyptic number.

It is an amenable number.

121281668 is a deficient number, since it is larger than the sum of its proper divisors (100189372).

121281668 is a wasteful number, since it uses less digits than its factorization.

121281668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318306 (or 1318304 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 121281668 is about 11012.7956486988. The cubic root of 121281668 is about 494.9922360446.

The spelling of 121281668 in words is "one hundred twenty-one million, two hundred eighty-one thousand, six hundred sixty-eight".