21222003221144 has 32 divisors (see below), whose sum is σ = 43409853199440. Its totient is φ = 9646096156800.

The previous prime is 21222003221141. The next prime is 21222003221173. The reversal of 21222003221144 is 44112230022212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222003221141) 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, 170399 + ... + 6517134.

Almost surely, 2^{21222003221144} is an apocalyptic number.

It is an amenable number.

21222003221144 is an abundant number, since it is smaller than the sum of its proper divisors (22187849978296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21222003221144 is a wasteful number, since it uses less digits than its factorization.

21222003221144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6723611 (or 6723607 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21222003221144 its reverse (44112230022212), we get a palindrome (65334233243356).

The spelling of 21222003221144 in words is "twenty-one trillion, two hundred twenty-two billion, three million, two hundred twenty-one thousand, one hundred forty-four".