20211302201221 has 2 divisors, whose sum is σ = 20211302201222. Its totient is φ = 20211302201220.

The previous prime is 20211302201219. The next prime is 20211302201287. The reversal of 20211302201221 is 12210220311202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19604483013025 + 606819188196 = 4427695^2 + 778986^2 .

It is a cyclic number.

It is not a de Polignac number, because 20211302201221 - 2¹ = 20211302201219 is a prime.

Together with 20211302201219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211302201291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105651100610 + 10105651100611.

It is an arithmetic number, because the mean of its divisors is an integer number (10105651100611).

Almost surely, 2^{20211302201221} is an apocalyptic number.

It is an amenable number.

20211302201221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211302201221 is an equidigital number, since it uses as much as digits as its factorization.

20211302201221 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 20211302201221 its reverse (12210220311202), we get a palindrome (32421522512423).

The spelling of 20211302201221 in words is "twenty trillion, two hundred eleven billion, three hundred two million, two hundred one thousand, two hundred twenty-one".