21043445024 has 24 divisors (see below), whose sum is σ = 47347751808. Its totient is φ = 9018619200.

The previous prime is 21043445021. The next prime is 21043445047. The reversal of 21043445024 is 42054434012.

It is a super-2 number, since 2×21043445024² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21043445021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46971752 + ... + 46972199.

It is an arithmetic number, because the mean of its divisors is an integer number (1972822992).

Almost surely, 2^21043445024 is an apocalyptic number.

It is an amenable number.

21043445024 is an abundant number, since it is smaller than the sum of its proper divisors (26304306784).

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

21043445024 is an equidigital number, since it uses as much as digits as its factorization.

21043445024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93943968 (or 93943960 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 29.

Adding to 21043445024 its reverse (42054434012), we get a palindrome (63097879036).

The spelling of 21043445024 in words is "twenty-one billion, forty-three million, four hundred forty-five thousand, twenty-four".