1111221212120 has 16 divisors (see below), whose sum is σ = 2500247727360. Its totient is φ = 444488484832.

The previous prime is 1111221212117. The next prime is 1111221212131. The reversal of 1111221212120 is 212121221111.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 13890265112 + ... + 13890265191.

It is an arithmetic number, because the mean of its divisors is an integer number (156265482960).

Almost surely, 2^{1111221212120} is an apocalyptic number.

1111221212120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1111221212120 is an abundant number, since it is smaller than the sum of its proper divisors (1389026515240).

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

1111221212120 is a wasteful number, since it uses less digits than its factorization.

1111221212120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27780530314 (or 27780530310 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1111221212120 its reverse (212121221111), we get a palindrome (1323342433231).

The spelling of 1111221212120 in words is "one trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twelve thousand, one hundred twenty".