2111010110221 has 4 divisors (see below), whose sum is σ = 2111081813532. Its totient is φ = 2110938406912.

The previous prime is 2111010110191. The next prime is 2111010110227. The reversal of 2111010110221 is 1220110101112.

It is a happy number.

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 1004232468996 + 1106777641225 = 1002114^2 + 1052035^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111010110221 - 2⁵ = 2111010110189 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 (2111010110227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35807476 + ... + 35866381.

It is an arithmetic number, because the mean of its divisors is an integer number (527770453383).

Almost surely, 2^{2111010110221} is an apocalyptic number.

It is an amenable number.

2111010110221 is a deficient number, since it is larger than the sum of its proper divisors (71703311).

2111010110221 is an equidigital number, since it uses as much as digits as its factorization.

2111010110221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71703310.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 2111010110221 its reverse (1220110101112), we get a palindrome (3331120211333).

The spelling of 2111010110221 in words is "two trillion, one hundred eleven billion, ten million, one hundred ten thousand, two hundred twenty-one".