21082236 has 24 divisors (see below), whose sum is σ = 56219520. Its totient is φ = 6023472.

The previous prime is 21082213. The next prime is 21082253. The reversal of 21082236 is 63228012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125406 + ... + 125573.

It is an arithmetic number, because the mean of its divisors is an integer number (2342480).

Almost surely, 2^21082236 is an apocalyptic number.

It is an amenable number.

21082236 is an abundant number, since it is smaller than the sum of its proper divisors (35137284).

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

21082236 is a wasteful number, since it uses less digits than its factorization.

21082236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250993 (or 250991 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 21082236 is about 4591.5396110673. The cubic root of 21082236 is about 276.2520801356.

The spelling of 21082236 in words is "twenty-one million, eighty-two thousand, two hundred thirty-six".