111211012221 has 8 divisors (see below), whose sum is σ = 152288953824. Its totient is φ = 72136872720.

The previous prime is 111211012207. The next prime is 111211012261. The reversal of 111211012221 is 122210112111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 111211012221 - 2¹⁴ = 111210995837 is a prime.

It is a super-2 number, since 2×111211012221² (a number of 23 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 111211012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111211012261) 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 7 ways as a sum of consecutive naturals, for example, 500950395 + ... + 500950616.

It is an arithmetic number, because the mean of its divisors is an integer number (19036119228).

Almost surely, 2^111211012221 is an apocalyptic number.

It is an amenable number.

111211012221 is a deficient number, since it is larger than the sum of its proper divisors (41077941603).

111211012221 is a wasteful number, since it uses less digits than its factorization.

111211012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001901051.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111211012221 its reverse (122210112111), we get a palindrome (233421124332).

The spelling of 111211012221 in words is "one hundred eleven billion, two hundred eleven million, twelve thousand, two hundred twenty-one".