21042031243024 has 40 divisors (see below), whose sum is σ = 44507737804608. Its totient is φ = 9557562794880.

The previous prime is 21042031243003. The next prime is 21042031243049. The reversal of 21042031243024 is 42034213024012.

It is a junction number, because it is equal to n+sod(n) for n = 21042031242983 and 21042031243001.

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, 43489107 + ... + 43970290.

Almost surely, 2^{21042031243024} is an apocalyptic number.

It is an amenable number.

21042031243024 is an abundant number, since it is smaller than the sum of its proper divisors (23465706561584).

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

21042031243024 is a wasteful number, since it uses less digits than its factorization.

21042031243024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87460783 (or 87460777 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21042031243024 its reverse (42034213024012), we get a palindrome (63076244267036).

The spelling of 21042031243024 in words is "twenty-one trillion, forty-two billion, thirty-one million, two hundred forty-three thousand, twenty-four".