21113000 has 64 divisors (see below), whose sum is σ = 50656320. Its totient is φ = 8232000.

The previous prime is 21112999. The next prime is 21113017. The reversal of 21113000 is 31112.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42755 + ... + 43245.

It is an arithmetic number, because the mean of its divisors is an integer number (791505).

Almost surely, 2^21113000 is an apocalyptic number.

21113000 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 21113000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25328160).

21113000 is an abundant number, since it is smaller than the sum of its proper divisors (29543320).

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

21113000 is a wasteful number, since it uses less digits than its factorization.

21113000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555 (or 541 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 21113000 is about 4594.8884643699. Note that the first 3 decimals coincide. The cubic root of 21113000 is about 276.3863873394.

Adding to 21113000 its reverse (31112), we get a palindrome (21144112).

The spelling of 21113000 in words is "twenty-one million, one hundred thirteen thousand".