111212221101221 has 8 divisors (see below), whose sum is σ = 111219952190688. Its totient is φ = 111204490342000.

The previous prime is 111212221101209. The next prime is 111212221101227. The reversal of 111212221101221 is 122101122212111.

It is a happy number.

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 111212221101221 - 2³⁰ = 111211147359397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111212221101193 and 111212221101202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212221101227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1139759366 + ... + 1139856936.

It is an arithmetic number, because the mean of its divisors is an integer number (13902494023836).

Almost surely, 2^{111212221101221} is an apocalyptic number.

It is an amenable number.

111212221101221 is a deficient number, since it is larger than the sum of its proper divisors (7731089467).

111212221101221 is an equidigital number, since it uses as much as digits as its factorization.

111212221101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165123.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 111212221101221 its reverse (122101122212111), we get a palindrome (233313343313332).

The spelling of 111212221101221 in words is "one hundred eleven trillion, two hundred twelve billion, two hundred twenty-one million, one hundred one thousand, two hundred twenty-one".