21313080 has 96 divisors (see below), whose sum is σ = 70302960. Its totient is φ = 5598720.

The previous prime is 21313063. The next prime is 21313091. The reversal of 21313080 is 8031312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25875 + ... + 26685.

Almost surely, 2^21313080 is an apocalyptic number.

21313080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21313080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35151480).

21313080 is an abundant number, since it is smaller than the sum of its proper divisors (48989880).

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

21313080 is a wasteful number, since it uses less digits than its factorization.

21313080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901 (or 894 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21313080 is about 4616.6091452494. The cubic root of 21313080 is about 277.2567139694.

Adding to 21313080 its reverse (8031312), we get a palindrome (29344392).

The spelling of 21313080 in words is "twenty-one million, three hundred thirteen thousand, eighty".