121868778 has 16 divisors (see below), whose sum is σ = 245353536. Its totient is φ = 40353600.

The previous prime is 121868753. The next prime is 121868821. The reversal of 121868778 is 877868121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66351 + ... + 68162.

It is an arithmetic number, because the mean of its divisors is an integer number (15334596).

Almost surely, 2^121868778 is an apocalyptic number.

121868778 is an abundant number, since it is smaller than the sum of its proper divisors (123484758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121868778 is a wasteful number, since it uses less digits than its factorization.

121868778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134669.

The product of its digits is 301056, while the sum is 48.

The square root of 121868778 is about 11039.4192782048. The cubic root of 121868778 is about 495.7896833139.

It can be divided in two parts, 1218 and 68778, that added together give a palindrome (69996).

The spelling of 121868778 in words is "one hundred twenty-one million, eight hundred sixty-eight thousand, seven hundred seventy-eight".