21040082704 has 15 divisors (see below), whose sum is σ = 40766284423. Its totient is φ = 10519751248.

The previous prime is 21040082683. The next prime is 21040082717. The reversal of 21040082704 is 40728004012.

The square root of 21040082704 is 145052.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 562077 + ... + 598339.

Almost surely, 2^21040082704 is an apocalyptic number.

21040082704 is the 145052-nd square number.

It is an amenable number.

21040082704 is a deficient number, since it is larger than the sum of its proper divisors (19726201719).

21040082704 is an frugal number, since it uses more digits than its factorization.

21040082704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72534 (or 36265 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

Adding to 21040082704 its reverse (40728004012), we get a palindrome (61768086716).

The spelling of 21040082704 in words is "twenty-one billion, forty million, eighty-two thousand, seven hundred four".