21033039 has 8 divisors (see below), whose sum is σ = 28399360. Its totient is φ = 13844376.

The previous prime is 21033011. The next prime is 21033053. The reversal of 21033039 is 93033012.

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

It is not a de Polignac number, because 21033039 - 2⁵ = 21033007 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 (21033059) by changing a digit.

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, 44137 + ... + 44610.

It is an arithmetic number, because the mean of its divisors is an integer number (3549920).

Almost surely, 2^21033039 is an apocalyptic number.

21033039 is a deficient number, since it is larger than the sum of its proper divisors (7366321).

21033039 is an equidigital number, since it uses as much as digits as its factorization.

21033039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88829.

The product of its (nonzero) digits is 486, while the sum is 21.

The square root of 21033039 is about 4586.1791286429. The cubic root of 21033039 is about 276.0370276934.

The spelling of 21033039 in words is "twenty-one million, thirty-three thousand, thirty-nine".