21313310680 has 32 divisors (see below), whose sum is σ = 48611872800. Its totient is φ = 8408537856.

The previous prime is 21313310659. The next prime is 21313310687. The reversal of 21313310680 is 8601331312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313310687) 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, 3646620 + ... + 3652459.

It is an arithmetic number, because the mean of its divisors is an integer number (1519121025).

Almost surely, 2^21313310680 is an apocalyptic number.

21313310680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21313310680 is an abundant number, since it is smaller than the sum of its proper divisors (27298562120).

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

21313310680 is a wasteful number, since it uses less digits than its factorization.

21313310680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7299163 (or 7299159 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

Adding to 21313310680 its reverse (8601331312), we get a palindrome (29914641992).

The spelling of 21313310680 in words is "twenty-one billion, three hundred thirteen million, three hundred ten thousand, six hundred eighty".