221000210221321 has 2 divisors, whose sum is σ = 221000210221322. Its totient is φ = 221000210221320.

The previous prime is 221000210221277. The next prime is 221000210221367. The reversal of 221000210221321 is 123122012000122.

221000210221321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149501094060096 + 71499116161225 = 12227064^2 + 8455715^2 .

It is a cyclic number.

It is not a de Polignac number, because 221000210221321 - 2⁹ = 221000210220809 is a prime.

It is a super-4 number, since 4×221000210221321⁴ (a number of 58 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (221000210221621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110500105110660 + 110500105110661.

It is an arithmetic number, because the mean of its divisors is an integer number (110500105110661).

Almost surely, 2^{221000210221321} is an apocalyptic number.

It is an amenable number.

221000210221321 is a deficient number, since it is larger than the sum of its proper divisors (1).

221000210221321 is an equidigital number, since it uses as much as digits as its factorization.

221000210221321 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 221000210221321 its reverse (123122012000122), we get a palindrome (344122222221443).

The spelling of 221000210221321 in words is "two hundred twenty-one trillion, two hundred ten million, two hundred twenty-one thousand, three hundred twenty-one".