21204320022444 has 48 divisors (see below), whose sum is σ = 53289901548800. Its totient is φ = 6523518254400.

The previous prime is 21204320022439. The next prime is 21204320022481. The reversal of 21204320022444 is 44422002340212.

It is a happy number.

It is a super-2 number, since 2×21204320022444² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8098594 + ... + 10392105.

Almost surely, 2^{21204320022444} is an apocalyptic number.

It is an amenable number.

21204320022444 is an abundant number, since it is smaller than the sum of its proper divisors (32085581526356).

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

21204320022444 is a wasteful number, since it uses less digits than its factorization.

21204320022444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18498070 (or 18498068 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 30.

Adding to 21204320022444 its reverse (44422002340212), we get a palindrome (65626322362656).

The spelling of 21204320022444 in words is "twenty-one trillion, two hundred four billion, three hundred twenty million, twenty-two thousand, four hundred forty-four".