2221199965 has 4 divisors (see below), whose sum is σ = 2665439964. Its totient is φ = 1776959968.

The previous prime is 2221199933. The next prime is 2221199977. The reversal of 2221199965 is 5699911222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5699911222 = 2 ⋅2849955611.

It can be written as a sum of positive squares in 2 ways, for example, as 1776285316 + 444914649 = 42146^2 + 21093^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221199965 - 2⁵ = 2221199933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222119992 + ... + 222120001.

It is an arithmetic number, because the mean of its divisors is an integer number (666359991).

Almost surely, 2^2221199965 is an apocalyptic number.

It is an amenable number.

2221199965 is a deficient number, since it is larger than the sum of its proper divisors (444239999).

2221199965 is an equidigital number, since it uses as much as digits as its factorization.

2221199965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444239998.

The product of its digits is 174960, while the sum is 46.

The square root of 2221199965 is about 47129.6081566567. The cubic root of 2221199965 is about 1304.7557496127.

The spelling of 2221199965 in words is "two billion, two hundred twenty-one million, one hundred ninety-nine thousand, nine hundred sixty-five".