21235039 has 8 divisors (see below), whose sum is σ = 24297120. Its totient is φ = 18180096.

The previous prime is 21235037. The next prime is 21235051. The reversal of 21235039 is 93053212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21235039 - 2¹ = 21235037 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 (21235037) 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, 8787 + ... + 10939.

It is an arithmetic number, because the mean of its divisors is an integer number (3037140).

Almost surely, 2^21235039 is an apocalyptic number.

21235039 is a deficient number, since it is larger than the sum of its proper divisors (3062081).

21235039 is a wasteful number, since it uses less digits than its factorization.

21235039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3569.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 21235039 is about 4608.1491946334. The cubic root of 21235039 is about 276.9178945750.

The spelling of 21235039 in words is "twenty-one million, two hundred thirty-five thousand, thirty-nine".