111001211221 has 16 divisors (see below), whose sum is σ = 117890519040. Its totient is φ = 104152296960.

The previous prime is 111001211219. The next prime is 111001211227. The reversal of 111001211221 is 122112100111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 111001211221 - 2¹ = 111001211219 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 (111001211227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9930966 + ... + 9942136.

It is an arithmetic number, because the mean of its divisors is an integer number (7368157440).

Almost surely, 2^111001211221 is an apocalyptic number.

It is an amenable number.

111001211221 is a deficient number, since it is larger than the sum of its proper divisors (6889307819).

111001211221 is a wasteful number, since it uses less digits than its factorization.

111001211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12924.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111001211221 its reverse (122112100111), we get a palindrome (233113311332).

The spelling of 111001211221 in words is "one hundred eleven billion, one million, two hundred eleven thousand, two hundred twenty-one".