21348080 has 60 divisors (see below), whose sum is σ = 53780040. Its totient is φ = 7877376.

The previous prime is 21348049. The next prime is 21348083. The reversal of 21348080 is 8084312.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21348083) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12731 + ... + 14309.

It is an arithmetic number, because the mean of its divisors is an integer number (896334).

Almost surely, 2^21348080 is an apocalyptic number.

21348080 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 21348080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26890020).

21348080 is an abundant number, since it is smaller than the sum of its proper divisors (32431960).

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

21348080 is a wasteful number, since it uses less digits than its factorization.

21348080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1618 (or 1599 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 21348080 is about 4620.3982512333. The cubic root of 21348080 is about 277.4083998186.

The spelling of 21348080 in words is "twenty-one million, three hundred forty-eight thousand, eighty".