21440113132444 has 12 divisors (see below), whose sum is σ = 37575948652144. Its totient is φ = 10704127803264.

The previous prime is 21440113132391. The next prime is 21440113132469. The reversal of 21440113132444 is 44423131104412.

It is a super-2 number, since 2×21440113132444² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3982187712 + ... + 3982193095.

Almost surely, 2^{21440113132444} is an apocalyptic number.

It is an amenable number.

21440113132444 is a deficient number, since it is larger than the sum of its proper divisors (16135835519700).

21440113132444 is a wasteful number, since it uses less digits than its factorization.

21440113132444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7964381484 (or 7964381482 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 34.

Adding to 21440113132444 its reverse (44423131104412), we get a palindrome (65863244236856).

The spelling of 21440113132444 in words is "twenty-one trillion, four hundred forty billion, one hundred thirteen million, one hundred thirty-two thousand, four hundred forty-four".