21317627 has 2 divisors, whose sum is σ = 21317628. Its totient is φ = 21317626.

The previous prime is 21317623. The next prime is 21317651. The reversal of 21317627 is 72671312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21317627 - 2² = 21317623 is a prime.

It is a super-2 number, since 2×21317627² = 908882441822258, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21317627.

It is not a weakly prime, because it can be changed into another prime (21317623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10658813 + 10658814.

It is an arithmetic number, because the mean of its divisors is an integer number (10658814).

Almost surely, 2^21317627 is an apocalyptic number.

21317627 is a deficient number, since it is larger than the sum of its proper divisors (1).

21317627 is an equidigital number, since it uses as much as digits as its factorization.

21317627 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 29.

The square root of 21317627 is about 4617.1015799958. The cubic root of 21317627 is about 277.2764295093.

Adding to 21317627 its reverse (72671312), we get a palindrome (93988939).

The spelling of 21317627 in words is "twenty-one million, three hundred seventeen thousand, six hundred twenty-seven".