111220021220 has 192 divisors, whose sum is σ = 302170079232. Its totient is φ = 33371136000.

The previous prime is 111220021219. The next prime is 111220021249. The reversal of 111220021220 is 22120022111.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 111220021195 and 111220021204.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9207785 + ... + 9219855.

It is an arithmetic number, because the mean of its divisors is an integer number (1573802496).

Almost surely, 2^111220021220 is an apocalyptic number.

111220021220 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 111220021220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151085039616).

111220021220 is an abundant number, since it is smaller than the sum of its proper divisors (190950058012).

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

111220021220 is a wasteful number, since it uses less digits than its factorization.

111220021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12322 (or 12320 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 111220021220 its reverse (22120022111), we get a palindrome (133340043331).

The spelling of 111220021220 in words is "one hundred eleven billion, two hundred twenty million, twenty-one thousand, two hundred twenty".