2100200000221 has 2 divisors, whose sum is σ = 2100200000222. Its totient is φ = 2100200000220.

The previous prime is 2100200000161. The next prime is 2100200000243. The reversal of 2100200000221 is 1220000020012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1850309988121 + 249890012100 = 1360261^2 + 499890^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100200000221 - 2¹⁷ = 2100199869149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2100200000198 and 2100200000207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100200000321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050100000110 + 1050100000111.

It is an arithmetic number, because the mean of its divisors is an integer number (1050100000111).

Almost surely, 2^{2100200000221} is an apocalyptic number.

It is an amenable number.

2100200000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100200000221 is an equidigital number, since it uses as much as digits as its factorization.

2100200000221 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 10.

Adding to 2100200000221 its reverse (1220000020012), we get a palindrome (3320200020233).

The spelling of 2100200000221 in words is "two trillion, one hundred billion, two hundred million, two hundred twenty-one", and thus it is an aban number.