111211830 has 48 divisors (see below), whose sum is σ = 290790864. Its totient is φ = 29488320.

The previous prime is 111211829. The next prime is 111211843. The reversal of 111211830 is 38112111.

It is a happy number.

It is a super-2 number, since 2×111211830² = 24736142263897800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12877 + ... + 19703.

It is an arithmetic number, because the mean of its divisors is an integer number (6058143).

Almost surely, 2^111211830 is an apocalyptic number.

111211830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 111211830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145395432).

111211830 is an abundant number, since it is smaller than the sum of its proper divisors (179579034).

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

111211830 is a wasteful number, since it uses less digits than its factorization.

111211830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7021 (or 7018 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

The square root of 111211830 is about 10545.7019681006. The cubic root of 111211830 is about 480.8950746736.

Adding to 111211830 its reverse (38112111), we get a palindrome (149323941).

The spelling of 111211830 in words is "one hundred eleven million, two hundred eleven thousand, eight hundred thirty".