121222170978 has 64 divisors (see below), whose sum is σ = 259902397440. Its totient is φ = 37579937472.

The previous prime is 121222170977. The next prime is 121222170983. The reversal of 121222170978 is 879071222121.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121222170973) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2210851 + ... + 2265017.

It is an arithmetic number, because the mean of its divisors is an integer number (4060974960).

Almost surely, 2^121222170978 is an apocalyptic number.

121222170978 is an abundant number, since it is smaller than the sum of its proper divisors (138680226462).

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

121222170978 is a wasteful number, since it uses less digits than its factorization.

121222170978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54551.

The product of its (nonzero) digits is 56448, while the sum is 42.

The spelling of 121222170978 in words is "one hundred twenty-one billion, two hundred twenty-two million, one hundred seventy thousand, nine hundred seventy-eight".