21735039 has 8 divisors (see below), whose sum is σ = 29064960. Its totient is φ = 14447576.

The previous prime is 21735037. The next prime is 21735053. The reversal of 21735039 is 93053712.

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 21735039 - 2¹ = 21735037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21734997 and 21735015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21735037) 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, 9399 + ... + 11480.

It is an arithmetic number, because the mean of its divisors is an integer number (3633120).

Almost surely, 2^21735039 is an apocalyptic number.

21735039 is a deficient number, since it is larger than the sum of its proper divisors (7329921).

21735039 is a wasteful number, since it uses less digits than its factorization.

21735039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21229.

The product of its (nonzero) digits is 5670, while the sum is 30.

The square root of 21735039 is about 4662.0852630556. The cubic root of 21735039 is about 279.0744909716.

The spelling of 21735039 in words is "twenty-one million, seven hundred thirty-five thousand, thirty-nine".