21043045450 has 48 divisors (see below), whose sum is σ = 45771802560. Its totient is φ = 7046968320.

The previous prime is 21043045399. The next prime is 21043045459. The reversal of 21043045450 is 5454034012.

It is not an unprimeable number, because it can be changed into a prime (21043045459) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 684055 + ... + 714154.

It is an arithmetic number, because the mean of its divisors is an integer number (953579220).

Almost surely, 2^21043045450 is an apocalyptic number.

21043045450 is an abundant number, since it is smaller than the sum of its proper divisors (24728757110).

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

21043045450 is a wasteful number, since it uses less digits than its factorization.

21043045450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398271 (or 1398266 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

Adding to 21043045450 its reverse (5454034012), we get a palindrome (26497079462).

The spelling of 21043045450 in words is "twenty-one billion, forty-three million, forty-five thousand, four hundred fifty".