21223023230221 has 8 divisors (see below), whose sum is σ = 21955493233080. Its totient is φ = 20490596001792.

The previous prime is 21223023230159. The next prime is 21223023230273. The reversal of 21223023230221 is 12203232032212.

It can be written as a sum of positive squares in 4 ways, for example, as 14565565388196 + 6657457842025 = 3816486^2 + 2580205^2 .

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 21223023230221 - 2¹⁷ = 21223023099149 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 (21223023230921) 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, 9682540 + ... + 11670373.

It is an arithmetic number, because the mean of its divisors is an integer number (2744436654135).

Almost surely, 2^{21223023230221} is an apocalyptic number.

It is an amenable number.

21223023230221 is a deficient number, since it is larger than the sum of its proper divisors (732470002859).

21223023230221 is a wasteful number, since it uses less digits than its factorization.

21223023230221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21387215.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21223023230221 its reverse (12203232032212), we get a palindrome (33426255262433).

The spelling of 21223023230221 in words is "twenty-one trillion, two hundred twenty-three billion, twenty-three million, two hundred thirty thousand, two hundred twenty-one".