2211102311221 has 4 divisors (see below), whose sum is σ = 2211132894700. Its totient is φ = 2211071727744.

The previous prime is 2211102311189. The next prime is 2211102311287. The reversal of 2211102311221 is 1221132011122.

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 155520598321 + 2055581712900 = 394361^2 + 1433730^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211102311221 - 2⁵ = 2211102311189 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 (2211102341221) 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, 15183036 + ... + 15327973.

It is an arithmetic number, because the mean of its divisors is an integer number (552783223675).

Almost surely, 2^{2211102311221} is an apocalyptic number.

It is an amenable number.

2211102311221 is a deficient number, since it is larger than the sum of its proper divisors (30583479).

2211102311221 is an equidigital number, since it uses as much as digits as its factorization.

2211102311221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30583478.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 2211102311221 its reverse (1221132011122), we get a palindrome (3432234322343).

The spelling of 2211102311221 in words is "two trillion, two hundred eleven billion, one hundred two million, three hundred eleven thousand, two hundred twenty-one".