20001222221223 has 4 divisors (see below), whose sum is σ = 26668296294968. Its totient is φ = 13334148147480.

The previous prime is 20001222221191. The next prime is 20001222221231. The reversal of 20001222221223 is 32212222210002.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20001222221223 - 2⁵ = 20001222221191 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 20001222221223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001222421223) 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, 3333537036868 + ... + 3333537036873.

It is an arithmetic number, because the mean of its divisors is an integer number (6667074073742).

Almost surely, 2^{20001222221223} is an apocalyptic number.

20001222221223 is a deficient number, since it is larger than the sum of its proper divisors (6667074073745).

20001222221223 is an equidigital number, since it uses as much as digits as its factorization.

20001222221223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6667074073744.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 20001222221223 its reverse (32212222210002), we get a palindrome (52213444431225).

The spelling of 20001222221223 in words is "twenty trillion, one billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty-three".