20233505043221 has 4 divisors (see below), whose sum is σ = 21423711222252. Its totient is φ = 19043298864192.

The previous prime is 20233505043217. The next prime is 20233505043239. The reversal of 20233505043221 is 12234050533202.

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 16324719028996 + 3908786014225 = 4040386^2 + 1977065^2 .

It is a cyclic number.

It is not a de Polignac number, because 20233505043221 - 2² = 20233505043217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20233505043211) 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, 595103089490 + ... + 595103089523.

It is an arithmetic number, because the mean of its divisors is an integer number (5355927805563).

Almost surely, 2^{20233505043221} is an apocalyptic number.

It is an amenable number.

20233505043221 is a deficient number, since it is larger than the sum of its proper divisors (1190206179031).

20233505043221 is a wasteful number, since it uses less digits than its factorization.

20233505043221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1190206179030.

The product of its (nonzero) digits is 43200, while the sum is 32.

Adding to 20233505043221 its reverse (12234050533202), we get a palindrome (32467555576423).

The spelling of 20233505043221 in words is "twenty trillion, two hundred thirty-three billion, five hundred five million, forty-three thousand, two hundred twenty-one".