2100102110221 has 2 divisors, whose sum is σ = 2100102110222. Its totient is φ = 2100102110220.

The previous prime is 2100102110207. The next prime is 2100102110273. The reversal of 2100102110221 is 1220112010012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1994224108900 + 105878001321 = 1412170^2 + 325389^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100102110221 - 2⁹ = 2100102109709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2100102110021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050051055110 + 1050051055111.

It is an arithmetic number, because the mean of its divisors is an integer number (1050051055111).

Almost surely, 2^{2100102110221} is an apocalyptic number.

It is an amenable number.

2100102110221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100102110221 is an equidigital number, since it uses as much as digits as its factorization.

2100102110221 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 13.

Adding to 2100102110221 its reverse (1220112010012), we get a palindrome (3320214120233).

The spelling of 2100102110221 in words is "two trillion, one hundred billion, one hundred two million, one hundred ten thousand, two hundred twenty-one".