121153778 has 8 divisors (see below), whose sum is σ = 183118320. Its totient is φ = 60114340.

The previous prime is 121153771. The next prime is 121153817. The reversal of 121153778 is 877351121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (121153771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230948 + ... + 231471.

It is an arithmetic number, because the mean of its divisors is an integer number (22889790).

Almost surely, 2^121153778 is an apocalyptic number.

121153778 is a deficient number, since it is larger than the sum of its proper divisors (61964542).

121153778 is a wasteful number, since it uses less digits than its factorization.

121153778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462552.

The product of its digits is 11760, while the sum is 35.

The square root of 121153778 is about 11006.9876896452. The cubic root of 121153778 is about 494.8181871482.

The spelling of 121153778 in words is "one hundred twenty-one million, one hundred fifty-three thousand, seven hundred seventy-eight".