20212222200221 has 4 divisors (see below), whose sum is σ = 20275983153852. Its totient is φ = 20148461246592.

The previous prime is 20212222200199. The next prime is 20212222200223. The reversal of 20212222200221 is 12200222221202.

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 1044199903321 + 19168022296900 = 1021861^2 + 4378130^2 .

It is a cyclic number.

It is not a de Polignac number, because 20212222200221 - 2³⁸ = 19937344293277 is a prime.

It is a super-2 number, since 2×20212222200221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20212222200193 and 20212222200202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212222200223) 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, 31880476340 + ... + 31880476973.

It is an arithmetic number, because the mean of its divisors is an integer number (5068995788463).

Almost surely, 2^{20212222200221} is an apocalyptic number.

It is an amenable number.

20212222200221 is a deficient number, since it is larger than the sum of its proper divisors (63760953631).

20212222200221 is an equidigital number, since it uses as much as digits as its factorization.

20212222200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63760953630.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 20212222200221 its reverse (12200222221202), we get a palindrome (32412444421423).

The spelling of 20212222200221 in words is "twenty trillion, two hundred twelve billion, two hundred twenty-two million, two hundred thousand, two hundred twenty-one".