21230200112221 has 2 divisors, whose sum is σ = 21230200112222. Its totient is φ = 21230200112220.

The previous prime is 21230200112201. The next prime is 21230200112237. The reversal of 21230200112221 is 12221100203212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18336166305625 + 2894033806596 = 4282075^2 + 1701186^2 .

It is a cyclic number.

It is not a de Polignac number, because 21230200112221 - 2¹⁵ = 21230200079453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21230200112201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10615100056110 + 10615100056111.

It is an arithmetic number, because the mean of its divisors is an integer number (10615100056111).

Almost surely, 2^{21230200112221} is an apocalyptic number.

It is an amenable number.

21230200112221 is a deficient number, since it is larger than the sum of its proper divisors (1).

21230200112221 is an equidigital number, since it uses as much as digits as its factorization.

21230200112221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21230200112221 its reverse (12221100203212), we get a palindrome (33451300315433).

Subtracting from 21230200112221 its reverse (12221100203212), we obtain a palindrome (9009099909009).

The spelling of 21230200112221 in words is "twenty-one trillion, two hundred thirty billion, two hundred million, one hundred twelve thousand, two hundred twenty-one".