111000001221 has 24 divisors (see below), whose sum is σ = 170344844280. Its totient is φ = 69517236096.

The previous prime is 111000001193. The next prime is 111000001237. The reversal of 111000001221 is 122100000111.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 66695645025 + 44304356196 = 258255^2 + 210486^2 .

It is not a de Polignac number, because 111000001221 - 2²⁷ = 110865783493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

111000001221 is a modest number, since divided by 1221 gives 1110 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111000001421) 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 23 ways as a sum of consecutive naturals, for example, 5737470 + ... + 5756783.

It is an arithmetic number, because the mean of its divisors is an integer number (7097701845).

Almost surely, 2^111000001221 is an apocalyptic number.

It is an amenable number.

111000001221 is a deficient number, since it is larger than the sum of its proper divisors (59344843059).

111000001221 is a wasteful number, since it uses less digits than its factorization.

111000001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11494325 (or 11494322 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 111000001221 its reverse (122100000111), we get a palindrome (233100001332).

The spelling of 111000001221 in words is "one hundred eleven billion, one thousand, two hundred twenty-one".