20233204221 has 4 divisors (see below), whose sum is σ = 26977605632. Its totient is φ = 13488802812.

The previous prime is 20233204183. The next prime is 20233204223. The reversal of 20233204221 is 12240233202.

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 not a de Polignac number, because 20233204221 - 2⁹ = 20233203709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20233204223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3372200701 + ... + 3372200706.

It is an arithmetic number, because the mean of its divisors is an integer number (6744401408).

Almost surely, 2^20233204221 is an apocalyptic number.

It is an amenable number.

20233204221 is a deficient number, since it is larger than the sum of its proper divisors (6744401411).

20233204221 is an equidigital number, since it uses as much as digits as its factorization.

20233204221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6744401410.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 20233204221 its reverse (12240233202), we get a palindrome (32473437423).

The spelling of 20233204221 in words is "twenty billion, two hundred thirty-three million, two hundred four thousand, two hundred twenty-one".