21362827 has 2 divisors, whose sum is σ = 21362828. Its totient is φ = 21362826.

The previous prime is 21362753. The next prime is 21362839. The reversal of 21362827 is 72826312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21362827 - 2¹⁵ = 21330059 is a prime.

It is not a weakly prime, because it can be changed into another prime (21362857) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10681413 + 10681414.

It is an arithmetic number, because the mean of its divisors is an integer number (10681414).

Almost surely, 2^21362827 is an apocalyptic number.

21362827 is a deficient number, since it is larger than the sum of its proper divisors (1).

21362827 is an equidigital number, since it uses as much as digits as its factorization.

21362827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 31.

The square root of 21362827 is about 4621.9938338341. The cubic root of 21362827 is about 277.4722619246.

The spelling of 21362827 in words is "twenty-one million, three hundred sixty-two thousand, eight hundred twenty-seven".