2201111221 has 6 divisors (see below), whose sum is σ = 2323056822. Its totient is φ = 2085262920.

The previous prime is 2201111179. The next prime is 2201111249. The reversal of 2201111221 is 1221111022.

It can be written as a sum of positive squares in only one way, i.e., 2068976196 + 132135025 = 45486^2 + 11495^2 .

It is not a de Polignac number, because 2201111221 - 2¹¹ = 2201109173 is a prime.

It is a super-2 number, since 2×2201111221² = 9689781214424221682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2201111021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3048270 + ... + 3048991.

It is an arithmetic number, because the mean of its divisors is an integer number (387176137).

Almost surely, 2^2201111221 is an apocalyptic number.

It is an amenable number.

2201111221 is a deficient number, since it is larger than the sum of its proper divisors (121945601).

2201111221 is an equidigital number, since it uses as much as digits as its factorization.

2201111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6097299 (or 6097280 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 2201111221 is about 46916.0017584619. The cubic root of 2201111221 is about 1300.8103864370.

Adding to 2201111221 its reverse (1221111022), we get a palindrome (3422222243).

The spelling of 2201111221 in words is "two billion, two hundred one million, one hundred eleven thousand, two hundred twenty-one".