1211111221120 has 64 divisors (see below), whose sum is σ = 2895640863840. Its totient is φ = 484389591040.

The previous prime is 1211111221051. The next prime is 1211111221171. The reversal of 1211111221120 is 211221111121.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 1211111221094 and 1211111221103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5798829 + ... + 6004051.

Almost surely, 2^{1211111221120} is an apocalyptic number.

1211111221120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211111221120 is an abundant number, since it is smaller than the sum of its proper divisors (1684529642720).

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

1211111221120 is an equidigital number, since it uses as much as digits as its factorization.

1211111221120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214463 (or 214451 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 1211111221120 its reverse (211221111121), we get a palindrome (1422332332241).

The spelling of 1211111221120 in words is "one trillion, two hundred eleven billion, one hundred eleven million, two hundred twenty-one thousand, one hundred twenty".