21017828876 has 12 divisors (see below), whose sum is σ = 40124946120. Its totient is φ = 9553558560.

The previous prime is 21017828863. The next prime is 21017828879. The reversal of 21017828876 is 67882871012.

It is not an unprimeable number, because it can be changed into a prime (21017828879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238838921 + ... + 238839008.

It is an arithmetic number, because the mean of its divisors is an integer number (3343745510).

Almost surely, 2^21017828876 is an apocalyptic number.

It is an amenable number.

21017828876 is a deficient number, since it is larger than the sum of its proper divisors (19107117244).

21017828876 is a wasteful number, since it uses less digits than its factorization.

21017828876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477677944 (or 477677942 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 50.

The spelling of 21017828876 in words is "twenty-one billion, seventeen million, eight hundred twenty-eight thousand, eight hundred seventy-six".