21134080 has 144 divisors (see below), whose sum is σ = 58867200. Its totient is φ = 7188480.

The previous prime is 21134063. The next prime is 21134081. The reversal of 21134080 is 8043112.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267481 + ... + 267559.

It is an arithmetic number, because the mean of its divisors is an integer number (408800).

Almost surely, 2^21134080 is an apocalyptic number.

21134080 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 21134080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29433600).

21134080 is an abundant number, since it is smaller than the sum of its proper divisors (37733120).

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

21134080 is a wasteful number, since it uses less digits than its factorization.

21134080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 116 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 21134080 is about 4597.1817453740. The cubic root of 21134080 is about 276.4783415395.

Adding to 21134080 its reverse (8043112), we get a palindrome (29177192).

The spelling of 21134080 in words is "twenty-one million, one hundred thirty-four thousand, eighty".