1221127194 has 32 divisors (see below), whose sum is σ = 2800152576. Its totient is φ = 347767920.

The previous prime is 1221127177. The next prime is 1221127199. The reversal of 1221127194 is 4917211221.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1221127199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33682 + ... + 59805.

It is an arithmetic number, because the mean of its divisors is an integer number (87504768).

Almost surely, 2^1221127194 is an apocalyptic number.

1221127194 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1221127194 is an abundant number, since it is smaller than the sum of its proper divisors (1579025382).

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

1221127194 is a wasteful number, since it uses less digits than its factorization.

1221127194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93810.

The product of its digits is 2016, while the sum is 30.

The square root of 1221127194 is about 34944.6304029675. The cubic root of 1221127194 is about 1068.8587109007.

The spelling of 1221127194 in words is "one billion, two hundred twenty-one million, one hundred twenty-seven thousand, one hundred ninety-four".