2122223221 has 4 divisors (see below), whose sum is σ = 2233919200. Its totient is φ = 2010527244.

The previous prime is 2122223209. The next prime is 2122223249. The reversal of 2122223221 is 1223222212.

2122223221 = 4258² + 4259² + ... + 4371².

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2122223221 - 2⁹ = 2122222709 is a prime.

It is a super-2 number, since 2×2122223221² = 9007662799503229682, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 111695959 = 2122223221 / (2 + 1 + 2 + 2 + 2 + 2 + 3 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122223291) 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, 55847961 + ... + 55847998.

It is an arithmetic number, because the mean of its divisors is an integer number (558479800).

Almost surely, 2^2122223221 is an apocalyptic number.

It is an amenable number.

2122223221 is a deficient number, since it is larger than the sum of its proper divisors (111695979).

2122223221 is a wasteful number, since it uses less digits than its factorization.

2122223221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111695978.

The product of its digits is 384, while the sum is 19.

The square root of 2122223221 is about 46067.5940439698. The cubic root of 2122223221 is about 1285.0805605900.

Adding to 2122223221 its reverse (1223222212), we get a palindrome (3345445433).

The spelling of 2122223221 in words is "two billion, one hundred twenty-two million, two hundred twenty-three thousand, two hundred twenty-one".