21020822584 has 16 divisors (see below), whose sum is σ = 41127696720. Its totient is φ = 10053436800.

The previous prime is 21020822573. The next prime is 21020822587. The reversal of 21020822584 is 48522802012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020822587) 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, 57121617 + ... + 57121984.

It is an arithmetic number, because the mean of its divisors is an integer number (2570481045).

Almost surely, 2^21020822584 is an apocalyptic number.

It is an amenable number.

21020822584 is a deficient number, since it is larger than the sum of its proper divisors (20106874136).

21020822584 is a wasteful number, since it uses less digits than its factorization.

21020822584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114243630 (or 114243626 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 34.

The spelling of 21020822584 in words is "twenty-one billion, twenty million, eight hundred twenty-two thousand, five hundred eighty-four".