111122212001221 has 8 divisors (see below), whose sum is σ = 114490979510040. Its totient is φ = 107800560122112.

The previous prime is 111122212001173. The next prime is 111122212001267. The reversal of 111122212001221 is 122100212221111.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 31740705264321 + 79381506736900 = 5633889^2 + 8909630^2 .

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 111122212001221 - 2⁷ = 111122212001093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111122212601221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11778902640 + ... + 11778912073.

It is an arithmetic number, because the mean of its divisors is an integer number (14311372438755).

Almost surely, 2^{111122212001221} is an apocalyptic number.

It is an amenable number.

111122212001221 is a deficient number, since it is larger than the sum of its proper divisors (3368767508819).

111122212001221 is an equidigital number, since it uses as much as digits as its factorization.

111122212001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23557814855.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 111122212001221 its reverse (122100212221111), we get a palindrome (233222424222332).

The spelling of 111122212001221 in words is "one hundred eleven trillion, one hundred twenty-two billion, two hundred twelve million, one thousand, two hundred twenty-one".