21083652 has 72 divisors (see below), whose sum is σ = 56056000. Its totient is φ = 6928416.

The previous prime is 21083633. The next prime is 21083669. The reversal of 21083652 is 25638012.

21083652 is a `hidden beast` number, since 2 + 1 + 0 + 8 + 3 + 652 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 105849 + ... + 106047.

Almost surely, 2^21083652 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 21083652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28028000).

21083652 is an abundant number, since it is smaller than the sum of its proper divisors (34972348).

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

21083652 is a wasteful number, since it uses less digits than its factorization.

21083652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327 (or 313 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 21083652 is about 4591.6938051225. The cubic root of 21083652 is about 276.2582648715.

The spelling of 21083652 in words is "twenty-one million, eighty-three thousand, six hundred fifty-two".