111231322220 has 48 divisors (see below), whose sum is σ = 236353523616. Its totient is φ = 43967040000.

The previous prime is 111231322199. The next prime is 111231322231. The reversal of 111231322220 is 22223132111.

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 = 111231322192 and 111231322201.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 999575 + ... + 1105265.

It is an arithmetic number, because the mean of its divisors is an integer number (4924031742).

Almost surely, 2^111231322220 is an apocalyptic number.

111231322220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111231322220 is an abundant number, since it is smaller than the sum of its proper divisors (125122201396).

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

111231322220 is a wasteful number, since it uses less digits than its factorization.

111231322220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106322 (or 106320 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 111231322220 its reverse (22223132111), we get a palindrome (133454454331).

The spelling of 111231322220 in words is "one hundred eleven billion, two hundred thirty-one million, three hundred twenty-two thousand, two hundred twenty".