21935039 has 8 divisors (see below), whose sum is σ = 25147008. Its totient is φ = 18742680.

The previous prime is 21935021. The next prime is 21935071. The reversal of 21935039 is 93053912.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21935039 is a prime.

It is a super-2 number, since 2×21935039² = 962291871863042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21934996 and 21935014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21935009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2417 + ... + 7050.

It is an arithmetic number, because the mean of its divisors is an integer number (3143376).

Almost surely, 2^21935039 is an apocalyptic number.

21935039 is a deficient number, since it is larger than the sum of its proper divisors (3211969).

21935039 is an equidigital number, since it uses as much as digits as its factorization.

21935039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9805.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 21935039 is about 4683.4857745060. The cubic root of 21935039 is about 279.9278683243.

The spelling of 21935039 in words is "twenty-one million, nine hundred thirty-five thousand, thirty-nine".