111212120111221 has 8 divisors (see below), whose sum is σ = 111710275405344. Its totient is φ = 110714847290640.

The previous prime is 111212120111207. The next prime is 111212120111243. The reversal of 111212120111221 is 122111021212111.

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 111212120111221 - 2²¹ = 111212118014069 is a prime.

It is a super-3 number, since 3×111212120111221³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111212120111201) 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, 220365775 + ... + 220869868.

It is an arithmetic number, because the mean of its divisors is an integer number (13963784425668).

Almost surely, 2^{111212120111221} is an apocalyptic number.

It is an amenable number.

111212120111221 is a deficient number, since it is larger than the sum of its proper divisors (498155294123).

111212120111221 is an equidigital number, since it uses as much as digits as its factorization.

111212120111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441236771.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 111212120111221 its reverse (122111021212111), we get a palindrome (233323141323332).

The spelling of 111212120111221 in words is "one hundred eleven trillion, two hundred twelve billion, one hundred twenty million, one hundred eleven thousand, two hundred twenty-one".