111221000 has 64 divisors (see below), whose sum is σ = 283944960. Its totient is φ = 40440000.

The previous prime is 111220999. The next prime is 111221023. The reversal of 111221000 is 122111.

It is a super-2 number, since 2×111221000² = 24740221682000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (8).

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, 5945 + ... + 16055.

It is an arithmetic number, because the mean of its divisors is an integer number (4436640).

Almost surely, 2^111221000 is an apocalyptic number.

111221000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111221000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141972480).

111221000 is an abundant number, since it is smaller than the sum of its proper divisors (172723960).

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

111221000 is a wasteful number, since it uses less digits than its factorization.

111221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10143 (or 10129 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 111221000 is about 10546.1367334204. The cubic root of 111221000 is about 480.9082917527.

Adding to 111221000 its reverse (122111), we get a palindrome (111343111).

The spelling of 111221000 in words is "one hundred eleven million, two hundred twenty-one thousand".