111001221210 has 128 divisors (see below), whose sum is σ = 292891023360. Its totient is φ = 26700076800.

The previous prime is 111001221169. The next prime is 111001221223. The reversal of 111001221210 is 12122100111.

It is a super-2 number, since 2×111001221210² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23499909 + ... + 23504631.

It is an arithmetic number, because the mean of its divisors is an integer number (2288211120).

Almost surely, 2^111001221210 is an apocalyptic number.

111001221210 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 111001221210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146445511680).

111001221210 is an abundant number, since it is smaller than the sum of its proper divisors (181889802150).

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

111001221210 is a wasteful number, since it uses less digits than its factorization.

111001221210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5284.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 111001221210 its reverse (12122100111), we get a palindrome (123123321321).

The spelling of 111001221210 in words is "one hundred eleven billion, one million, two hundred twenty-one thousand, two hundred ten".