111211012220 has 48 divisors (see below), whose sum is σ = 291170654208. Its totient is φ = 34663172160.

The previous prime is 111211012207. The next prime is 111211012261. The reversal of 111211012220 is 22210112111.

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 = 111211012195 and 111211012204.

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, 36105932 + ... + 36109011.

It is an arithmetic number, because the mean of its divisors is an integer number (6066055296).

Almost surely, 2^111211012220 is an apocalyptic number.

111211012220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111211012220 is an abundant number, since it is smaller than the sum of its proper divisors (179959641988).

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

111211012220 is a wasteful number, since it uses less digits than its factorization.

111211012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72214970 (or 72214968 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 111211012220 its reverse (22210112111), we get a palindrome (133421124331).

The spelling of 111211012220 in words is "one hundred eleven billion, two hundred eleven million, twelve thousand, two hundred twenty".