21082112 has 26 divisors (see below), whose sum is σ = 42167268. Its totient is φ = 10539008.

The previous prime is 21082111. The next prime is 21082123. The reversal of 21082112 is 21128012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21082111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1523 + ... + 6669.

It is an arithmetic number, because the mean of its divisors is an integer number (1621818).

Almost surely, 2^21082112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21082112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21083634).

21082112 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21082112 is an frugal number, since it uses more digits than its factorization.

21082112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5171 (or 5149 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 21082112 is about 4591.5261079515. The cubic root of 21082112 is about 276.2515385212.

The spelling of 21082112 in words is "twenty-one million, eighty-two thousand, one hundred twelve".