1111211001221 has 16 divisors (see below), whose sum is σ = 1197581967360. Its totient is φ = 1027337068800.

The previous prime is 1111211001179. The next prime is 1111211001233. The reversal of 1111211001221 is 1221001121111.

It is a cyclic number.

It is not a de Polignac number, because 1111211001221 - 2²² = 1111206806917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1111211001196 and 1111211001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111211001421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2329901 + ... + 2766018.

It is an arithmetic number, because the mean of its divisors is an integer number (74848872960).

Almost surely, 2^{1111211001221} is an apocalyptic number.

It is an amenable number.

1111211001221 is a deficient number, since it is larger than the sum of its proper divisors (86370966139).

1111211001221 is a wasteful number, since it uses less digits than its factorization.

1111211001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5096164.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1111211001221 its reverse (1221001121111), we get a palindrome (2332212122332).

The spelling of 1111211001221 in words is "one trillion, one hundred eleven billion, two hundred eleven million, one thousand, two hundred twenty-one".