111222211210021 has 8 divisors (see below), whose sum is σ = 113935509082584. Its totient is φ = 108508940052480.

The previous prime is 111222211210013. The next prime is 111222211210051. The reversal of 111222211210021 is 120012112222111.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1647667468225 + 109574543741796 = 1283615^2 + 10467786^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 111222211210021 - 2³ = 111222211210013 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 (111222211210051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1881595 + ... + 15032791.

It is an arithmetic number, because the mean of its divisors is an integer number (14241938635323).

Almost surely, 2^{111222211210021} is an apocalyptic number.

It is an amenable number.

111222211210021 is a deficient number, since it is larger than the sum of its proper divisors (2713297872563).

111222211210021 is a wasteful number, since it uses less digits than its factorization.

111222211210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13357511.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 111222211210021 its reverse (120012112222111), we get a palindrome (231234323432132).

The spelling of 111222211210021 in words is "one hundred eleven trillion, two hundred twenty-two billion, two hundred eleven million, two hundred ten thousand, twenty-one".