21259728004 has 12 divisors (see below), whose sum is σ = 37217873728. Its totient is φ = 10626049800.

The previous prime is 21259727981. The next prime is 21259728011. The reversal of 21259728004 is 40082795212.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 940992 + ... + 963319.

Almost surely, 2^21259728004 is an apocalyptic number.

It is an amenable number.

21259728004 is a deficient number, since it is larger than the sum of its proper divisors (15958145724).

21259728004 is a wasteful number, since it uses less digits than its factorization.

21259728004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1907106 (or 1907104 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 21259728004 in words is "twenty-one billion, two hundred fifty-nine million, seven hundred twenty-eight thousand, four".