111211221221120 has 72 divisors (see below), whose sum is σ = 275571339744960. Its totient is φ = 42950540595200.

The previous prime is 111211221221099. The next prime is 111211221221141. The reversal of 111211221221120 is 21122122112111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (111211221221099) and next prime (111211221221141).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 111211221221092 and 111211221221101.

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, 1497958856 + ... + 1498033095.

It is an arithmetic number, because the mean of its divisors is an integer number (3827379718680).

Almost surely, 2^{111211221221120} is an apocalyptic number.

111211221221120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111211221221120 is an abundant number, since it is smaller than the sum of its proper divisors (164360118523840).

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

111211221221120 is an equidigital number, since it uses as much as digits as its factorization.

111211221221120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2995992001 (or 2995991987 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 111211221221120 its reverse (21122122112111), we get a palindrome (132333343333231).

The spelling of 111211221221120 in words is "one hundred eleven trillion, two hundred eleven billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty".