21083136 has 44 divisors (see below), whose sum is σ = 56202432. Its totient is φ = 7026688.

The previous prime is 21083113. The next prime is 21083147. The reversal of 21083136 is 63138012.

It is a super-4 number, since 4×21083136⁴ (a number of 30 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360 + ... + 6503.

It is an arithmetic number, because the mean of its divisors is an integer number (1277328).

Almost surely, 2^21083136 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 21083136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28101216).

21083136 is an abundant number, since it is smaller than the sum of its proper divisors (35119296).

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

21083136 is an equidigital number, since it uses as much as digits as its factorization.

21083136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6886 (or 6868 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21083136 is about 4591.6376163630. The cubic root of 21083136 is about 276.2560111439.

The spelling of 21083136 in words is "twenty-one million, eighty-three thousand, one hundred thirty-six".