222111100021 has 4 divisors (see below), whose sum is σ = 229770103500. Its totient is φ = 214452096544.

The previous prime is 222111099989. The next prime is 222111100051. The reversal of 222111100021 is 120001111222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120001111222 = 2 ⋅60000555611.

It can be written as a sum of positive squares in 2 ways, for example, as 61362225796 + 160748874225 = 247714^2 + 400935^2 .

It is a cyclic number.

It is not a de Polignac number, because 222111100021 - 2⁵ = 222111099989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 222111099974 and 222111100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222111100051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3829501696 + ... + 3829501753.

It is an arithmetic number, because the mean of its divisors is an integer number (57442525875).

Almost surely, 2^222111100021 is an apocalyptic number.

It is an amenable number.

222111100021 is a deficient number, since it is larger than the sum of its proper divisors (7659003479).

222111100021 is an equidigital number, since it uses as much as digits as its factorization.

222111100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7659003478.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 222111100021 its reverse (120001111222), we get a palindrome (342112211243).

The spelling of 222111100021 in words is "two hundred twenty-two billion, one hundred eleven million, one hundred thousand, twenty-one".