121312168 has 8 divisors (see below), whose sum is σ = 227460330. Its totient is φ = 60656080.

The previous prime is 121312151. The next prime is 121312171. The reversal of 121312168 is 861213121.

It can be written as a sum of positive squares in only one way, i.e., 119290084 + 2022084 = 10922^2 + 1422^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7582003 + ... + 7582018.

Almost surely, 2^121312168 is an apocalyptic number.

It is an amenable number.

121312168 is a deficient number, since it is larger than the sum of its proper divisors (106148162).

121312168 is a wasteful number, since it uses less digits than its factorization.

121312168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15164027 (or 15164023 counting only the distinct ones).

The product of its digits is 576, while the sum is 25.

The square root of 121312168 is about 11014.1803144855. The cubic root of 121312168 is about 495.0337262332.

Adding to 121312168 its reverse (861213121), we get a palindrome (982525289).

The spelling of 121312168 in words is "one hundred twenty-one million, three hundred twelve thousand, one hundred sixty-eight".