2210111111221 has 4 divisors (see below), whose sum is σ = 2380119658252. Its totient is φ = 2040102564192.

The previous prime is 2210111111209. The next prime is 2210111111231. The reversal of 2210111111221 is 1221111110122.

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 690411428100 + 1519699683121 = 830910^2 + 1232761^2 .

It is a cyclic number.

It is not a de Polignac number, because 2210111111221 - 2¹⁹ = 2210110586933 is a prime.

It is a super-2 number, since 2×2210111111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2210111111195 and 2210111111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2210111111231) 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, 85004273496 + ... + 85004273521.

It is an arithmetic number, because the mean of its divisors is an integer number (595029914563).

Almost surely, 2^{2210111111221} is an apocalyptic number.

It is an amenable number.

2210111111221 is a deficient number, since it is larger than the sum of its proper divisors (170008547031).

2210111111221 is a wasteful number, since it uses less digits than its factorization.

2210111111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170008547030.

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

Adding to 2210111111221 its reverse (1221111110122), we get a palindrome (3431222221343).

The spelling of 2210111111221 in words is "two trillion, two hundred ten billion, one hundred eleven million, one hundred eleven thousand, two hundred twenty-one".