21673027 has 2 divisors, whose sum is σ = 21673028. Its totient is φ = 21673026.

The previous prime is 21673021. The next prime is 21673031. The reversal of 21673027 is 72037612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21673027 - 2⁷ = 21672899 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21672986 and 21673004.

It is not a weakly prime, because it can be changed into another prime (21673021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10836513 + 10836514.

It is an arithmetic number, because the mean of its divisors is an integer number (10836514).

Almost surely, 2^21673027 is an apocalyptic number.

21673027 is a deficient number, since it is larger than the sum of its proper divisors (1).

21673027 is an equidigital number, since it uses as much as digits as its factorization.

21673027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 21673027 is about 4655.4298405196. The cubic root of 21673027 is about 278.8088300425.

The spelling of 21673027 in words is "twenty-one million, six hundred seventy-three thousand, twenty-seven".