111011212121220 has 240 divisors, whose sum is σ = 359514625333248. Its totient is φ = 28645298161920.

The previous prime is 111011212121209. The next prime is 111011212121291. The reversal of 111011212121220 is 22121212110111.

It is a happy number.

111011212121220 is a `hidden beast` number, since 1 + 110 + 1 + 1 + 212 + 121 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 111011212121193 and 111011212121202.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 550159669 + ... + 550361411.

Almost surely, 2^{111011212121220} is an apocalyptic number.

111011212121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111011212121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179757312666624).

111011212121220 is an abundant number, since it is smaller than the sum of its proper divisors (248503413212028).

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

111011212121220 is a wasteful number, since it uses less digits than its factorization.

111011212121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212752 (or 212741 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 111011212121220 its reverse (22121212110111), we get a palindrome (133132424231331).

The spelling of 111011212121220 in words is "one hundred eleven trillion, eleven billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twenty".