1221201121194 has 48 divisors (see below), whose sum is σ = 2658784328928. Its totient is φ = 405091949856.

The previous prime is 1221201121187. The next prime is 1221201121219. The reversal of 1221201121194 is 4911211021221.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9197044 + ... + 9328880.

It is an arithmetic number, because the mean of its divisors is an integer number (55391340186).

Almost surely, 2^{1221201121194} is an apocalyptic number.

1221201121194 is an abundant number, since it is smaller than the sum of its proper divisors (1437583207734).

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

1221201121194 is a wasteful number, since it uses less digits than its factorization.

1221201121194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134339 (or 134336 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The spelling of 1221201121194 in words is "one trillion, two hundred twenty-one billion, two hundred one million, one hundred twenty-one thousand, one hundred ninety-four".