20212223331221 has 4 divisors (see below), whose sum is σ = 21276024559200. Its totient is φ = 19148422103244.

The previous prime is 20212223331169. The next prime is 20212223331229. The reversal of 20212223331221 is 12213332221202.

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 a de Polignac number, because none of the positive numbers 2^k-20212223331221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212223331229) 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, 531900613961 + ... + 531900613998.

It is an arithmetic number, because the mean of its divisors is an integer number (5319006139800).

Almost surely, 2^{20212223331221} is an apocalyptic number.

It is an amenable number.

20212223331221 is a deficient number, since it is larger than the sum of its proper divisors (1063801227979).

20212223331221 is a wasteful number, since it uses less digits than its factorization.

20212223331221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063801227978.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 20212223331221 its reverse (12213332221202), we get a palindrome (32425555552423).

The spelling of 20212223331221 in words is "twenty trillion, two hundred twelve billion, two hundred twenty-three million, three hundred thirty-one thousand, two hundred twenty-one".