21031044113424 has 80 divisors (see below), whose sum is σ = 54367503546752. Its totient is φ = 7005535617024.

The previous prime is 21031044113423. The next prime is 21031044113461. The reversal of 21031044113424 is 42431144013012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21031044113391 and 21031044113400.

It is not an unprimeable number, because it can be changed into a prime (21031044113423) 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 15 ways as a sum of consecutive naturals, for example, 677029317 + ... + 677060379.

Almost surely, 2^{21031044113424} is an apocalyptic number.

21031044113424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21031044113424 is an abundant number, since it is smaller than the sum of its proper divisors (33336459433328).

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

21031044113424 is a wasteful number, since it uses less digits than its factorization.

21031044113424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40304 (or 40298 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

Adding to 21031044113424 its reverse (42431144013012), we get a palindrome (63462188126436).

The spelling of 21031044113424 in words is "twenty-one trillion, thirty-one billion, forty-four million, one hundred thirteen thousand, four hundred twenty-four".