2100010020221 has 2 divisors, whose sum is σ = 2100010020222. Its totient is φ = 2100010020220.

The previous prime is 2100010020209. The next prime is 2100010020253. The reversal of 2100010020221 is 1220200100012.

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., 2099641572196 + 368448025 = 1449014^2 + 19195^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100010020221 - 2²² = 2100005825917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100010020271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050005010110 + 1050005010111.

It is an arithmetic number, because the mean of its divisors is an integer number (1050005010111).

Almost surely, 2^{2100010020221} is an apocalyptic number.

It is an amenable number.

2100010020221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100010020221 is an equidigital number, since it uses as much as digits as its factorization.

2100010020221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 2100010020221 its reverse (1220200100012), we get a palindrome (3320210120233).

The spelling of 2100010020221 in words is "two trillion, one hundred billion, ten million, twenty thousand, two hundred twenty-one".