2101112202221 has 4 divisors (see below), whose sum is σ = 2140755828732. Its totient is φ = 2061468575712.

The previous prime is 2101112202209. The next prime is 2101112202311. The reversal of 2101112202221 is 1222022111012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1176031802500 + 925080399721 = 1084450^2 + 961811^2 .

It is not a de Polignac number, because 2101112202221 - 2³⁴ = 2083932333037 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2101112202221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101112252221) 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, 19821813176 + ... + 19821813281.

It is an arithmetic number, because the mean of its divisors is an integer number (535188957183).

Almost surely, 2^{2101112202221} is an apocalyptic number.

It is an amenable number.

2101112202221 is a deficient number, since it is larger than the sum of its proper divisors (39643626511).

2101112202221 is an equidigital number, since it uses as much as digits as its factorization.

2101112202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39643626510.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 2101112202221 its reverse (1222022111012), we get a palindrome (3323134313233).

The spelling of 2101112202221 in words is "two trillion, one hundred one billion, one hundred twelve million, two hundred two thousand, two hundred twenty-one".