111223123220 has 48 divisors (see below), whose sum is σ = 269790429888. Its totient is φ = 38065666560.

The previous prime is 111223123217. The next prime is 111223123313. The reversal of 111223123220 is 22321322111.

It is a super-2 number, since 2×111223123220² (a number of 23 digits) contains 22 as substring.

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 = 111223123192 and 111223123201.

It is a congruent number.

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, 14865662 + ... + 14873141.

It is an arithmetic number, because the mean of its divisors is an integer number (5620633956).

Almost surely, 2^111223123220 is an apocalyptic number.

111223123220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111223123220 is an abundant number, since it is smaller than the sum of its proper divisors (158567306668).

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

111223123220 is a wasteful number, since it uses less digits than its factorization.

111223123220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29738840 (or 29738838 counting only the distinct ones).

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

Adding to 111223123220 its reverse (22321322111), we get a palindrome (133544445331).

The spelling of 111223123220 in words is "one hundred eleven billion, two hundred twenty-three million, one hundred twenty-three thousand, two hundred twenty".