20221210221 has 4 divisors (see below), whose sum is σ = 26961613632. Its totient is φ = 13480806812.

The previous prime is 20221210181. The next prime is 20221210223. The reversal of 20221210221 is 12201212202.

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 20221210221 - 2⁶ = 20221210157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20221210221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221210223) 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 3 ways as a sum of consecutive naturals, for example, 3370201701 + ... + 3370201706.

It is an arithmetic number, because the mean of its divisors is an integer number (6740403408).

Almost surely, 2^20221210221 is an apocalyptic number.

It is an amenable number.

20221210221 is a deficient number, since it is larger than the sum of its proper divisors (6740403411).

20221210221 is an equidigital number, since it uses as much as digits as its factorization.

20221210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6740403410.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20221210221 its reverse (12201212202), we get a palindrome (32422422423).

The spelling of 20221210221 in words is "twenty billion, two hundred twenty-one million, two hundred ten thousand, two hundred twenty-one".