21043332410 has 16 divisors (see below), whose sum is σ = 38801852712. Its totient is φ = 8212032000.

The previous prime is 21043332407. The next prime is 21043332421. The reversal of 21043332410 is 1423334012.

It can be written as a sum of positive squares in 4 ways, for example, as 9036213481 + 12007118929 = 95059^2 + 109577^2 .

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, 25662191 + ... + 25663010.

Almost surely, 2^21043332410 is an apocalyptic number.

21043332410 is a deficient number, since it is larger than the sum of its proper divisors (17758520302).

21043332410 is a wasteful number, since it uses less digits than its factorization.

21043332410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51325249.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21043332410 its reverse (1423334012), we get a palindrome (22466666422).

The spelling of 21043332410 in words is "twenty-one billion, forty-three million, three hundred thirty-two thousand, four hundred ten".