1111211101221 has 16 divisors (see below), whose sum is σ = 1601652049536. Its totient is φ = 681222125376.

The previous prime is 1111211101207. The next prime is 1111211101223. The reversal of 1111211101221 is 1221011121111.

It is not a de Polignac number, because 1111211101221 - 2⁹ = 1111211100709 is a prime.

It is a super-2 number, since 2×1111211101221² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1111211101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111211101223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54158170 + ... + 54178683.

It is an arithmetic number, because the mean of its divisors is an integer number (100103253096).

Almost surely, 2^{1111211101221} is an apocalyptic number.

It is an amenable number.

1111211101221 is a deficient number, since it is larger than the sum of its proper divisors (490440948315).

1111211101221 is a wasteful number, since it uses less digits than its factorization.

1111211101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108337132.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1111211101221 its reverse (1221011121111), we get a palindrome (2332222222332).

The spelling of 1111211101221 in words is "one trillion, one hundred eleven billion, two hundred eleven million, one hundred one thousand, two hundred twenty-one".