20212210210221 has 12 divisors (see below), whose sum is σ = 29202921976540. Its totient is φ = 13471341932160.

The previous prime is 20212210210177. The next prime is 20212210210253. The reversal of 20212210210221 is 12201201221202.

It is a happy number.

20212210210221 is a `hidden beast` number, since 2 + 0 + 21 + 2 + 210 + 210 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7145329955625 + 13066880254596 = 2673075^2 + 3614814^2 .

It is not a de Polignac number, because 20212210210221 - 2²² = 20212206015917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20212210210194 and 20212210210203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212210280221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 288702610 + ... + 288772611.

Almost surely, 2^{20212210210221} is an apocalyptic number.

It is an amenable number.

20212210210221 is a deficient number, since it is larger than the sum of its proper divisors (8990711766319).

20212210210221 is a wasteful number, since it uses less digits than its factorization.

20212210210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577479116 (or 577479113 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20212210210221 its reverse (12201201221202), we get a palindrome (32413411431423).

The spelling of 20212210210221 in words is "twenty trillion, two hundred twelve billion, two hundred ten million, two hundred ten thousand, two hundred twenty-one".