21286627 has 2 divisors, whose sum is σ = 21286628. Its totient is φ = 21286626.

The previous prime is 21286613. The next prime is 21286633. The reversal of 21286627 is 72668212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21286627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21286592 and 21286601.

It is not a weakly prime, because it can be changed into another prime (21286607) 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, 10643313 + 10643314.

It is an arithmetic number, because the mean of its divisors is an integer number (10643314).

Almost surely, 2^21286627 is an apocalyptic number.

21286627 is a deficient number, since it is larger than the sum of its proper divisors (1).

21286627 is an equidigital number, since it uses as much as digits as its factorization.

21286627 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 34.

The square root of 21286627 is about 4613.7432741755. The cubic root of 21286627 is about 277.1419595824.

The spelling of 21286627 in words is "twenty-one million, two hundred eighty-six thousand, six hundred twenty-seven".