2021716110221 has 2 divisors, whose sum is σ = 2021716110222. Its totient is φ = 2021716110220.

The previous prime is 2021716110157. The next prime is 2021716110259. The reversal of 2021716110221 is 1220116171202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2011818844996 + 9897265225 = 1418386^2 + 99485^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021716110221 - 2⁶ = 2021716110157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021716119221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010858055110 + 1010858055111.

It is an arithmetic number, because the mean of its divisors is an integer number (1010858055111).

Almost surely, 2^{2021716110221} is an apocalyptic number.

It is an amenable number.

2021716110221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021716110221 is an equidigital number, since it uses as much as digits as its factorization.

2021716110221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 26.

The spelling of 2021716110221 in words is "two trillion, twenty-one billion, seven hundred sixteen million, one hundred ten thousand, two hundred twenty-one".