20212110180221 has 2 divisors, whose sum is σ = 20212110180222. Its totient is φ = 20212110180220.

The previous prime is 20212110180193. The next prime is 20212110180247. The reversal of 20212110180221 is 12208101121202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10691886324025 + 9520223856196 = 3269845^2 + 3085486^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212110180221 - 2¹⁰ = 20212110179197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20212110380221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106055090110 + 10106055090111.

It is an arithmetic number, because the mean of its divisors is an integer number (10106055090111).

Almost surely, 2^{20212110180221} is an apocalyptic number.

It is an amenable number.

20212110180221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20212110180221 is an equidigital number, since it uses as much as digits as its factorization.

20212110180221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 23.

The spelling of 20212110180221 in words is "twenty trillion, two hundred twelve billion, one hundred ten million, one hundred eighty thousand, two hundred twenty-one".