121724168 has 8 divisors (see below), whose sum is σ = 228232830. Its totient is φ = 60862080.

The previous prime is 121724167. The next prime is 121724221. The reversal of 121724168 is 861427121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 111471364 + 10252804 = 10558^2 + 3202^2 .

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

It is not an unprimeable number, because it can be changed into a prime (121724167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7607753 + ... + 7607768.

Almost surely, 2^121724168 is an apocalyptic number.

It is an amenable number.

121724168 is a deficient number, since it is larger than the sum of its proper divisors (106508662).

121724168 is a wasteful number, since it uses less digits than its factorization.

121724168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15215527 (or 15215523 counting only the distinct ones).

The product of its digits is 5376, while the sum is 32.

The square root of 121724168 is about 11032.8676236054. The cubic root of 121724168 is about 495.5935036625.

The spelling of 121724168 in words is "one hundred twenty-one million, seven hundred twenty-four thousand, one hundred sixty-eight".