21589766472 has 16 divisors (see below), whose sum is σ = 53974416240. Its totient is φ = 7196588816.

The previous prime is 21589766467. The next prime is 21589766509. The reversal of 21589766472 is 27466798512.

It is a happy number.

It is a super-2 number, since 2×21589766472² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 449786778 + ... + 449786825.

It is an arithmetic number, because the mean of its divisors is an integer number (3373401015).

Almost surely, 2^21589766472 is an apocalyptic number.

It is an amenable number.

21589766472 is an abundant number, since it is smaller than the sum of its proper divisors (32384649768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21589766472 is a wasteful number, since it uses less digits than its factorization.

21589766472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899573612 (or 899573608 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 57.

The spelling of 21589766472 in words is "twenty-one billion, five hundred eighty-nine million, seven hundred sixty-six thousand, four hundred seventy-two".