1111212210221 has 8 divisors (see below), whose sum is σ = 1112600325144. Its totient is φ = 1109824372800.

The previous prime is 1111212210187. The next prime is 1111212210253. The reversal of 1111212210221 is 1220122121111.

It can be written as a sum of positive squares in 4 ways, for example, as 885501702121 + 225710508100 = 941011^2 + 475090^2 .

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 1111212210221 - 2¹⁴ = 1111212193837 is a prime.

It is a super-2 number, since 2×1111212210221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1111212210221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111212210421) 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, 8619191 + ... + 8747163.

It is an arithmetic number, because the mean of its divisors is an integer number (139075040643).

Almost surely, 2^{1111212210221} is an apocalyptic number.

It is an amenable number.

1111212210221 is a deficient number, since it is larger than the sum of its proper divisors (1388114923).

1111212210221 is an equidigital number, since it uses as much as digits as its factorization.

1111212210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138751.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1111212210221 its reverse (1220122121111), we get a palindrome (2331334331332).

The spelling of 1111212210221 in words is "one trillion, one hundred eleven billion, two hundred twelve million, two hundred ten thousand, two hundred twenty-one".