21043320044 has 12 divisors (see below), whose sum is σ = 36828960168. Its totient is φ = 10520760000.

The previous prime is 21043320037. The next prime is 21043320071. The reversal of 21043320044 is 44002334012.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170957 + ... + 267044.

It is an arithmetic number, because the mean of its divisors is an integer number (3069080014).

Almost surely, 2^21043320044 is an apocalyptic number.

It is an amenable number.

21043320044 is a deficient number, since it is larger than the sum of its proper divisors (15785640124).

21043320044 is a wasteful number, since it uses less digits than its factorization.

21043320044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450016 (or 450014 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21043320044 its reverse (44002334012), we get a palindrome (65045654056).

The spelling of 21043320044 in words is "twenty-one billion, forty-three million, three hundred twenty thousand, forty-four".