2123202221 has 4 divisors (see below), whose sum is σ = 2426516832. Its totient is φ = 1819887612.

The previous prime is 2123202209. The next prime is 2123202229. The reversal of 2123202221 is 1222023212.

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 2123202221 - 2⁶ = 2123202157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2123202221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123202229) 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, 151657295 + ... + 151657308.

It is an arithmetic number, because the mean of its divisors is an integer number (606629208).

Almost surely, 2^2123202221 is an apocalyptic number.

It is an amenable number.

2123202221 is a deficient number, since it is larger than the sum of its proper divisors (303314611).

2123202221 is an equidigital number, since it uses as much as digits as its factorization.

2123202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303314610.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 2123202221 is about 46078.2185093999. The cubic root of 2123202221 is about 1285.2781364858.

Adding to 2123202221 its reverse (1222023212), we get a palindrome (3345225433).

The spelling of 2123202221 in words is "two billion, one hundred twenty-three million, two hundred two thousand, two hundred twenty-one".