21223320230213 has 4 divisors (see below), whose sum is σ = 21249170803788. Its totient is φ = 21197469656640.

The previous prime is 21223320230191. The next prime is 21223320230219. The reversal of 21223320230213 is 31203202332212.

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 4515361503844 + 16707958726369 = 2124938^2 + 4087537^2 .

It is a cyclic number.

It is not a de Polignac number, because 21223320230213 - 2²⁴ = 21223303452997 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 (21223320230219) 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, 12925285556 + ... + 12925287197.

It is an arithmetic number, because the mean of its divisors is an integer number (5312292700947).

Almost surely, 2^{21223320230213} is an apocalyptic number.

It is an amenable number.

21223320230213 is a deficient number, since it is larger than the sum of its proper divisors (25850573575).

21223320230213 is an equidigital number, since it uses as much as digits as its factorization.

21223320230213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25850573574.

The product of its (nonzero) digits is 5184, while the sum is 26.

Adding to 21223320230213 its reverse (31203202332212), we get a palindrome (52426522562425).

The spelling of 21223320230213 in words is "twenty-one trillion, two hundred twenty-three billion, three hundred twenty million, two hundred thirty thousand, two hundred thirteen".