21194827 has 4 divisors (see below), whose sum is σ = 21711816. Its totient is φ = 20677840.

The previous prime is 21194819. The next prime is 21194851. The reversal of 21194827 is 72849112.

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 21194827 - 2³ = 21194819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21194792 and 21194801.

It is not an unprimeable number, because it can be changed into a prime (21194527) 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, 258433 + ... + 258514.

It is an arithmetic number, because the mean of its divisors is an integer number (5427954).

Almost surely, 2^21194827 is an apocalyptic number.

21194827 is a deficient number, since it is larger than the sum of its proper divisors (516989).

21194827 is an equidigital number, since it uses as much as digits as its factorization.

21194827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516988.

The product of its digits is 8064, while the sum is 34.

The square root of 21194827 is about 4603.7839871132. The cubic root of 21194827 is about 276.7429877666.

The spelling of 21194827 in words is "twenty-one million, one hundred ninety-four thousand, eight hundred twenty-seven".