21113080 has 64 divisors (see below), whose sum is σ = 50621760. Its totient is φ = 7907328.

The previous prime is 21113069. The next prime is 21113083. The reversal of 21113080 is 8031112.

21113080 is nontrivially palindromic in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113083) 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, 48544 + ... + 48976.

It is an arithmetic number, because the mean of its divisors is an integer number (790965).

Almost surely, 2^21113080 is an apocalyptic number.

21113080 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 21113080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25310880).

21113080 is an abundant number, since it is smaller than the sum of its proper divisors (29508680).

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

21113080 is a wasteful number, since it uses less digits than its factorization.

21113080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520 (or 516 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 21113080 is about 4594.8971696873. The cubic root of 21113080 is about 276.3867364274.

Adding to 21113080 its reverse (8031112), we get a palindrome (29144192).

The spelling of 21113080 in words is "twenty-one million, one hundred thirteen thousand, eighty".