20210413302221 has 2 divisors, whose sum is σ = 20210413302222. Its totient is φ = 20210413302220.

The previous prime is 20210413302203. The next prime is 20210413302257. The reversal of 20210413302221 is 12220331401202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19406324478121 + 804088824100 = 4405261^2 + 896710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20210413302221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20210413302281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105206651110 + 10105206651111.

It is an arithmetic number, because the mean of its divisors is an integer number (10105206651111).

Almost surely, 2^{20210413302221} is an apocalyptic number.

It is an amenable number.

20210413302221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210413302221 is an equidigital number, since it uses as much as digits as its factorization.

20210413302221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 20210413302221 its reverse (12220331401202), we get a palindrome (32430744703423).

The spelling of 20210413302221 in words is "twenty trillion, two hundred ten billion, four hundred thirteen million, three hundred two thousand, two hundred twenty-one".