2221221211 has 4 divisors (see below), whose sum is σ = 2423150424. Its totient is φ = 2019292000.

The previous prime is 2221221209. The next prime is 2221221221. The reversal of 2221221211 is 1121221222.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2221221211 - 2¹ = 2221221209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221221221) 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, 100964590 + ... + 100964611.

It is an arithmetic number, because the mean of its divisors is an integer number (605787606).

Almost surely, 2^2221221211 is an apocalyptic number.

2221221211 is a deficient number, since it is larger than the sum of its proper divisors (201929213).

2221221211 is a wasteful number, since it uses less digits than its factorization.

2221221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201929212.

The product of its digits is 64, while the sum is 16.

The square root of 2221221211 is about 47129.8335558275. The cubic root of 2221221211 is about 1304.7599096392.

Adding to 2221221211 its reverse (1121221222), we get a palindrome (3342442433).

The spelling of 2221221211 in words is "two billion, two hundred twenty-one million, two hundred twenty-one thousand, two hundred eleven".