21676607 has 2 divisors, whose sum is σ = 21676608. Its totient is φ = 21676606.

The previous prime is 21676579. The next prime is 21676619. The reversal of 21676607 is 70667612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21676607 - 2⁸ = 21676351 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21676637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10838303 + 10838304.

It is an arithmetic number, because the mean of its divisors is an integer number (10838304).

Almost surely, 2^21676607 is an apocalyptic number.

21676607 is a deficient number, since it is larger than the sum of its proper divisors (1).

21676607 is an equidigital number, since it uses as much as digits as its factorization.

21676607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 21676607 is about 4655.8143218990. The cubic root of 21676607 is about 278.8241806234.

The spelling of 21676607 in words is "twenty-one million, six hundred seventy-six thousand, six hundred seven".