21676039 has 16 divisors (see below), whose sum is σ = 27336960. Its totient is φ = 16695360.

The previous prime is 21676033. The next prime is 21676091. The reversal of 21676039 is 93067612.

It is not a de Polignac number, because 21676039 - 2⁵ = 21676007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21675995 and 21676013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21676033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5272 + ... + 8434.

It is an arithmetic number, because the mean of its divisors is an integer number (1708560).

Almost surely, 2^21676039 is an apocalyptic number.

21676039 is a deficient number, since it is larger than the sum of its proper divisors (5660921).

21676039 is a wasteful number, since it uses less digits than its factorization.

21676039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3270.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 21676039 is about 4655.7533225032. The cubic root of 21676039 is about 278.8217452250.

It can be divided in two parts, 2167603 and 9, that added together give a palindrome (2167612).

The spelling of 21676039 in words is "twenty-one million, six hundred seventy-six thousand, thirty-nine".