21328970860 has 24 divisors (see below), whose sum is σ = 45525117456. Its totient is φ = 8391725760.

The previous prime is 21328970849. The next prime is 21328970869. The reversal of 21328970860 is 6807982312.

It is a self number, because there is not a number n which added to its sum of digits gives 21328970860.

It is not an unprimeable number, because it can be changed into a prime (21328970869) 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, 8740162 + ... + 8742601.

It is an arithmetic number, because the mean of its divisors is an integer number (1896879894).

Almost surely, 2^21328970860 is an apocalyptic number.

21328970860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21328970860 is an abundant number, since it is smaller than the sum of its proper divisors (24196146596).

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

21328970860 is a wasteful number, since it uses less digits than its factorization.

21328970860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17482833 (or 17482831 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 21328970860 in words is "twenty-one billion, three hundred twenty-eight million, nine hundred seventy thousand, eight hundred sixty".