111121122112220 has 48 divisors (see below), whose sum is σ = 254569111221600. Its totient is φ = 40407566104320.

The previous prime is 111121122112151. The next prime is 111121122112223. The reversal of 111121122112220 is 22211221121111.

It is a happy number.

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 = 111121122112192 and 111121122112201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121122112223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136987586 + ... + 137796374.

It is an arithmetic number, because the mean of its divisors is an integer number (5303523150450).

Almost surely, 2^{111121122112220} is an apocalyptic number.

111121122112220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111121122112220 is an abundant number, since it is smaller than the sum of its proper divisors (143447989109380).

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

111121122112220 is a wasteful number, since it uses less digits than its factorization.

111121122112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433318 (or 1433316 counting only the distinct ones).

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

Adding to 111121122112220 its reverse (22211221121111), we get a palindrome (133332343233331).

The spelling of 111121122112220 in words is "one hundred eleven trillion, one hundred twenty-one billion, one hundred twenty-two million, one hundred twelve thousand, two hundred twenty".