21300827 has 4 divisors (see below), whose sum is σ = 21323736. Its totient is φ = 21277920.

The previous prime is 21300791. The next prime is 21300833. The reversal of 21300827 is 72800312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21300827 - 2⁸ = 21300571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21300127) 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 in 3 ways as a sum of consecutive naturals, for example, 9998 + ... + 11939.

It is an arithmetic number, because the mean of its divisors is an integer number (5330934).

Almost surely, 2^21300827 is an apocalyptic number.

21300827 is a deficient number, since it is larger than the sum of its proper divisors (22909).

21300827 is an equidigital number, since it uses as much as digits as its factorization.

21300827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22908.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 21300827 is about 4615.2818982160. The cubic root of 21300827 is about 277.2035716775.

The spelling of 21300827 in words is "twenty-one million, three hundred thousand, eight hundred twenty-seven".