21676069 has 4 divisors (see below), whose sum is σ = 22043520. Its totient is φ = 21308620.

The previous prime is 21676033. The next prime is 21676091. The reversal of 21676069 is 96067612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21676069 is a prime.

It is a super-2 number, since 2×21676069² = 939703934585522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21676469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183637 + ... + 183754.

It is an arithmetic number, because the mean of its divisors is an integer number (5510880).

Almost surely, 2^21676069 is an apocalyptic number.

It is an amenable number.

21676069 is a deficient number, since it is larger than the sum of its proper divisors (367451).

21676069 is an equidigital number, since it uses as much as digits as its factorization.

21676069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367450.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 21676069 is about 4655.7565443223. The cubic root of 21676069 is about 278.8218738563.

The spelling of 21676069 in words is "twenty-one million, six hundred seventy-six thousand, sixty-nine".