21828504806 has 16 divisors (see below), whose sum is σ = 34469277360. Its totient is φ = 10338852960.

The previous prime is 21828504757. The next prime is 21828504809. The reversal of 21828504806 is 60840582812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21828504809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 542876 + ... + 581696.

It is an arithmetic number, because the mean of its divisors is an integer number (2154329835).

Almost surely, 2^21828504806 is an apocalyptic number.

21828504806 is a deficient number, since it is larger than the sum of its proper divisors (12640772554).

21828504806 is a wasteful number, since it uses less digits than its factorization.

21828504806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53639.

The product of its (nonzero) digits is 245760, while the sum is 44.

The spelling of 21828504806 in words is "twenty-one billion, eight hundred twenty-eight million, five hundred four thousand, eight hundred six".