121220778 has 32 divisors (see below), whose sum is σ = 293376384. Its totient is φ = 32596992.

The previous prime is 121220777. The next prime is 121220789. The reversal of 121220778 is 877022121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (121220777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84175 + ... + 85602.

It is an arithmetic number, because the mean of its divisors is an integer number (9168012).

Almost surely, 2^121220778 is an apocalyptic number.

121220778 is an abundant number, since it is smaller than the sum of its proper divisors (172155606).

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

121220778 is a wasteful number, since it uses less digits than its factorization.

121220778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169806.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 121220778 is about 11010.0307901477. The cubic root of 121220778 is about 494.9093844943.

Adding to 121220778 its reverse (877022121), we get a palindrome (998242899).

The spelling of 121220778 in words is "one hundred twenty-one million, two hundred twenty thousand, seven hundred seventy-eight".