111221001221 has 8 divisors (see below), whose sum is σ = 123621285024.
Its totient is φ = 99202264720.
The previous prime is 111221001211. The next prime is 111221001239. The reversal of 111221001221 is 122100122111.
Adding to 111221001221 its reverse (122100122111), we get a palindrome (233321123332).
It can be divided in two parts, 11 and 1221001221, that multiplied together give a palindrome (13431013431).
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is not a de Polignac number, because 111221001221 - 210 = 111221000197 is a prime.
It is a super-2 number, since 2×1112210012212 (a number of 23 digits) contains 22 as substring.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 111221001196 and 111221001205.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (111221001211) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95386211 + ... + 95387376.
It is an arithmetic number, because the mean of its divisors is an integer number (15452660628).
Almost surely, 2111221001221 is an apocalyptic number.
111221001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.
It is an amenable number.
111221001221 is a deficient number, since it is larger than the sum of its proper divisors (12400283803).
111221001221 is a wasteful number, since it uses less digits than its factorization.
111221001221 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 190773651.
The product of its (nonzero) digits is 16, while the sum is 14.
The spelling of 111221001221 in words is "one hundred eleven billion, two hundred twenty-one million, one thousand, two hundred twenty-one".