1211121119978 has 16 divisors (see below), whose sum is σ = 2264953783104. Its totient is φ = 471865371360.

The previous prime is 1211121119947. The next prime is 1211121119983. The reversal of 1211121119978 is 8799111211121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3932211275 + ... + 3932211582.

It is an arithmetic number, because the mean of its divisors is an integer number (141559611444).

Almost surely, 2^{1211121119978} is an apocalyptic number.

1211121119978 is a deficient number, since it is larger than the sum of its proper divisors (1053832663126).

1211121119978 is a wasteful number, since it uses less digits than its factorization.

1211121119978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7864422877.

The product of its digits is 18144, while the sum is 44.

The spelling of 1211121119978 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, one hundred nineteen thousand, nine hundred seventy-eight".