21222004160344 has 32 divisors (see below), whose sum is σ = 42866096429520. Its totient is φ = 9791577403776.

The previous prime is 21222004160293. The next prime is 21222004160381. The reversal of 21222004160344 is 44306140022212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32947699 + ... + 33585634.

Almost surely, 2^{21222004160344} is an apocalyptic number.

It is an amenable number.

21222004160344 is an abundant number, since it is smaller than the sum of its proper divisors (21644092269176).

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

21222004160344 is a wasteful number, since it uses less digits than its factorization.

21222004160344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66536419 (or 66536415 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 21222004160344 its reverse (44306140022212), we get a palindrome (65528144182556).

The spelling of 21222004160344 in words is "twenty-one trillion, two hundred twenty-two billion, four million, one hundred sixty thousand, three hundred forty-four".