2223222121 has 4 divisors (see below), whose sum is σ = 2223399892. Its totient is φ = 2223044352.

The previous prime is 2223222109. The next prime is 2223222137. The reversal of 2223222121 is 1212223222.

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 1932042025 + 291180096 = 43955^2 + 17064^2 .

It is a cyclic number.

It is not a de Polignac number, because 2223222121 - 2¹⁷ = 2223091049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2223222151) 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, 68580 + ... + 95653.

It is an arithmetic number, because the mean of its divisors is an integer number (555849973).

Almost surely, 2^2223222121 is an apocalyptic number.

It is an amenable number.

2223222121 is a deficient number, since it is larger than the sum of its proper divisors (177771).

2223222121 is a wasteful number, since it uses less digits than its factorization.

2223222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177770.

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

The square root of 2223222121 is about 47151.0564144644. The cubic root of 2223222121 is about 1305.1515746099.

Adding to 2223222121 its reverse (1212223222), we get a palindrome (3435445343).

The spelling of 2223222121 in words is "two billion, two hundred twenty-three million, two hundred twenty-two thousand, one hundred twenty-one".