21113433444 has 24 divisors (see below), whose sum is σ = 49388781568. Its totient is φ = 7020082080.

The previous prime is 21113433443. The next prime is 21113433503. The reversal of 21113433444 is 44433431112.

It is a super-2 number, since 2×21113433444² (a number of 21 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (21113433443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2211172 + ... + 2220699.

Almost surely, 2^21113433444 is an apocalyptic number.

It is an amenable number.

21113433444 is an abundant number, since it is smaller than the sum of its proper divisors (28275348124).

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

21113433444 is a wasteful number, since it uses less digits than its factorization.

21113433444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4432275 (or 4432273 counting only the distinct ones).

The product of its digits is 13824, while the sum is 30.

Adding to 21113433444 its reverse (44433431112), we get a palindrome (65546864556).

The spelling of 21113433444 in words is "twenty-one billion, one hundred thirteen million, four hundred thirty-three thousand, four hundred forty-four".