21234441444 has 24 divisors (see below), whose sum is σ = 49694063328. Its totient is φ = 7057142400.

The previous prime is 21234441373. The next prime is 21234441457. The reversal of 21234441444 is 44414443212.

It is a nude number because it is divisible by every one of its digits.

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, 2621382 + ... + 2629469.

It is an arithmetic number, because the mean of its divisors is an integer number (2070585972).

Almost surely, 2^21234441444 is an apocalyptic number.

It is an amenable number.

21234441444 is an abundant number, since it is smaller than the sum of its proper divisors (28459621884).

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

21234441444 is a wasteful number, since it uses less digits than its factorization.

21234441444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5251195 (or 5251193 counting only the distinct ones).

The product of its digits is 49152, while the sum is 33.

Adding to 21234441444 its reverse (44414443212), we get a palindrome (65648884656).

The spelling of 21234441444 in words is "twenty-one billion, two hundred thirty-four million, four hundred forty-one thousand, four hundred forty-four".