20212200210221 has 4 divisors (see below), whose sum is σ = 20213718453852. Its totient is φ = 20210681966592.

The previous prime is 20212200210203. The next prime is 20212200210259. The reversal of 20212200210221 is 12201200221202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9200514565225 + 11011685644996 = 3033235^2 + 3318386^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212200210221 - 2⁶ = 20212200210157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20212200210221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212200210281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 759101846 + ... + 759128471.

It is an arithmetic number, because the mean of its divisors is an integer number (5053429613463).

Almost surely, 2^{20212200210221} is an apocalyptic number.

It is an amenable number.

20212200210221 is a deficient number, since it is larger than the sum of its proper divisors (1518243631).

20212200210221 is a wasteful number, since it uses less digits than its factorization.

20212200210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518243630.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20212200210221 its reverse (12201200221202), we get a palindrome (32413400431423).

The spelling of 20212200210221 in words is "twenty trillion, two hundred twelve billion, two hundred million, two hundred ten thousand, two hundred twenty-one".