2123223221 has 8 divisors (see below), whose sum is σ = 2432595264. Its totient is φ = 1815364800.

The previous prime is 2123223199. The next prime is 2123223257. The reversal of 2123223221 is 1223223212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2123223221 - 2¹⁰ = 2123222197 is a prime.

It is a super-2 number, since 2×2123223221² = 9016153692387229682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2123223193 and 2123223202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123222221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375395 + ... + 381008.

It is an arithmetic number, because the mean of its divisors is an integer number (304074408).

Almost surely, 2^2123223221 is an apocalyptic number.

It is an amenable number.

2123223221 is a deficient number, since it is larger than the sum of its proper divisors (309372043).

2123223221 is an equidigital number, since it uses as much as digits as its factorization.

2123223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756811.

The product of its digits is 576, while the sum is 20.

The square root of 2123223221 is about 46078.4463822295. The cubic root of 2123223221 is about 1285.2823739141.

Adding to 2123223221 its reverse (1223223212), we get a palindrome (3346446433).

Subtracting from 2123223221 its reverse (1223223212), we obtain a palindrome (900000009).

The spelling of 2123223221 in words is "two billion, one hundred twenty-three million, two hundred twenty-three thousand, two hundred twenty-one".