20212101323221 has 4 divisors (see below), whose sum is σ = 20864104591744. Its totient is φ = 19560098054700.

The previous prime is 20212101323171. The next prime is 20212101323243. The reversal of 20212101323221 is 12232310121202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20212101323221 - 2¹¹ = 20212101321173 is a prime.

It is a super-2 number, since 2×20212101323221² (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 = 20212101323192 and 20212101323201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212101323021) 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, 326001634215 + ... + 326001634276.

It is an arithmetic number, because the mean of its divisors is an integer number (5216026147936).

Almost surely, 2^{20212101323221} is an apocalyptic number.

It is an amenable number.

20212101323221 is a deficient number, since it is larger than the sum of its proper divisors (652003268523).

20212101323221 is an equidigital number, since it uses as much as digits as its factorization.

20212101323221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652003268522.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 20212101323221 its reverse (12232310121202), we get a palindrome (32444411444423).

The spelling of 20212101323221 in words is "twenty trillion, two hundred twelve billion, one hundred one million, three hundred twenty-three thousand, two hundred twenty-one".