2045111221 has 4 divisors (see below), whose sum is σ = 2052494572. Its totient is φ = 2037727872.

The previous prime is 2045111219. The next prime is 2045111231. The reversal of 2045111221 is 1221115402.

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 1090980900 + 954130321 = 33030^2 + 30889^2 .

It is a cyclic number.

It is not a de Polignac number, because 2045111221 - 2¹ = 2045111219 is a prime.

It is a super-2 number, since 2×2045111221² = 8364959812520221682, 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 (2045111231) 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, 3691260 + ... + 3691813.

It is an arithmetic number, because the mean of its divisors is an integer number (513123643).

Almost surely, 2^2045111221 is an apocalyptic number.

It is an amenable number.

2045111221 is a deficient number, since it is larger than the sum of its proper divisors (7383351).

2045111221 is an equidigital number, since it uses as much as digits as its factorization.

2045111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7383350.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 2045111221 is about 45222.9059327240. The cubic root of 2045111221 is about 1269.3234706643.

Adding to 2045111221 its reverse (1221115402), we get a palindrome (3266226623).

The spelling of 2045111221 in words is "two billion, forty-five million, one hundred eleven thousand, two hundred twenty-one".