21082733 has 8 divisors (see below), whose sum is σ = 24682560. Its totient is φ = 17629920.

The previous prime is 21082729. The next prime is 21082757. The reversal of 21082733 is 33728012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21082733 - 2² = 21082729 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21082783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36443 + ... + 37016.

It is an arithmetic number, because the mean of its divisors is an integer number (3085320).

Almost surely, 2^21082733 is an apocalyptic number.

It is an amenable number.

21082733 is a deficient number, since it is larger than the sum of its proper divisors (3599827).

21082733 is an equidigital number, since it uses as much as digits as its factorization.

21082733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73507.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 21082733 is about 4591.5937320281. The cubic root of 21082733 is about 276.2542509395.

The spelling of 21082733 in words is "twenty-one million, eighty-two thousand, seven hundred thirty-three".