21082933 has 4 divisors (see below), whose sum is σ = 21652780. Its totient is φ = 20513088.

The previous prime is 21082903. The next prime is 21082939. The reversal of 21082933 is 33928012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17960644 + 3122289 = 4238^2 + 1767^2 .

It is a cyclic number.

It is not a de Polignac number, because 21082933 - 2²¹ = 18985781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21082939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284868 + ... + 284941.

It is an arithmetic number, because the mean of its divisors is an integer number (5413195).

Almost surely, 2^21082933 is an apocalyptic number.

It is an amenable number.

21082933 is a deficient number, since it is larger than the sum of its proper divisors (569847).

21082933 is an equidigital number, since it uses as much as digits as its factorization.

21082933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569846.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 21082933 is about 4591.6155109068. The cubic root of 21082933 is about 276.2551244929.

It can be divided in two parts, 2108 and 2933, that added together give a square (5041 = 71²).

The spelling of 21082933 in words is "twenty-one million, eighty-two thousand, nine hundred thirty-three".