2111011220221 has 8 divisors (see below), whose sum is σ = 2119879801080. Its totient is φ = 2102158958592.

The previous prime is 2111011220207. The next prime is 2111011220231. The reversal of 2111011220221 is 1220221101112.

It can be written as a sum of positive squares in 4 ways, for example, as 518379840196 + 1592631380025 = 719986^2 + 1261995^2 .

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 2111011220221 - 2⁵ = 2111011220189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111011220195 and 2111011220204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111011220231) 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 7 ways as a sum of consecutive naturals, for example, 3820516 + ... + 4338013.

It is an arithmetic number, because the mean of its divisors is an integer number (264984975135).

Almost surely, 2^{2111011220221} is an apocalyptic number.

It is an amenable number.

2111011220221 is a deficient number, since it is larger than the sum of its proper divisors (8868580859).

2111011220221 is an equidigital number, since it uses as much as digits as its factorization.

2111011220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8159615.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2111011220221 its reverse (1220221101112), we get a palindrome (3331232321333).

The spelling of 2111011220221 in words is "two trillion, one hundred eleven billion, eleven million, two hundred twenty thousand, two hundred twenty-one".