20210200001221 has 2 divisors, whose sum is σ = 20210200001222. Its totient is φ = 20210200001220.

The previous prime is 20210200001219. The next prime is 20210200001261. The reversal of 20210200001221 is 12210000201202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18990080933121 + 1220119068100 = 4357761^2 + 1104590^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210200001221 - 2¹ = 20210200001219 is a prime.

Together with 20210200001219, 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 (20210200001261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105100000610 + 10105100000611.

It is an arithmetic number, because the mean of its divisors is an integer number (10105100000611).

Almost surely, 2^{20210200001221} is an apocalyptic number.

It is an amenable number.

20210200001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210200001221 is an equidigital number, since it uses as much as digits as its factorization.

20210200001221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20210200001221 its reverse (12210000201202), we get a palindrome (32420200202423).

The spelling of 20210200001221 in words is "twenty trillion, two hundred ten billion, two hundred million, one thousand, two hundred twenty-one".