201221201213 has 2 divisors, whose sum is σ = 201221201214. Its totient is φ = 201221201212.

The previous prime is 201221201119. The next prime is 201221201239. The reversal of 201221201213 is 312102122102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196592031769 + 4629169444 = 443387^2 + 68038^2 .

It is a cyclic number.

It is not a de Polignac number, because 201221201213 - 2²² = 201217006909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201221201191 and 201221201200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201221201243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610600606 + 100610600607.

It is an arithmetic number, because the mean of its divisors is an integer number (100610600607).

Almost surely, 2^201221201213 is an apocalyptic number.

It is an amenable number.

201221201213 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221201213 is an equidigital number, since it uses as much as digits as its factorization.

201221201213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 201221201213 its reverse (312102122102), we get a palindrome (513323323315).

The spelling of 201221201213 in words is "two hundred one billion, two hundred twenty-one million, two hundred one thousand, two hundred thirteen".