20001222210221 has 8 divisors (see below), whose sum is σ = 22863786097920. Its totient is φ = 17139969929808.

The previous prime is 20001222210199. The next prime is 20001222210223. The reversal of 20001222210221 is 12201222210002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20001222210221 - 2¹⁴ = 20001222193837 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 20001222210221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001222210223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327869141 + ... + 327930138.

It is an arithmetic number, because the mean of its divisors is an integer number (2857973262240).

Almost surely, 2^{20001222210221} is an apocalyptic number.

It is an amenable number.

20001222210221 is a deficient number, since it is larger than the sum of its proper divisors (2862563887699).

20001222210221 is an equidigital number, since it uses as much as digits as its factorization.

20001222210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655803643.

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

Adding to 20001222210221 its reverse (12201222210002), we get a palindrome (32202444420223).

The spelling of 20001222210221 in words is "twenty trillion, one billion, two hundred twenty-two million, two hundred ten thousand, two hundred twenty-one".