21827386 has 24 divisors (see below), whose sum is σ = 38132640. Its totient is φ = 9179280.

The previous prime is 21827381. The next prime is 21827387. The reversal of 21827386 is 68372812.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21827381) 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 in 11 ways as a sum of consecutive naturals, for example, 51885 + ... + 52303.

It is an arithmetic number, because the mean of its divisors is an integer number (1588860).

Almost surely, 2^21827386 is an apocalyptic number.

21827386 is a deficient number, since it is larger than the sum of its proper divisors (16305254).

21827386 is an equidigital number, since it uses as much as digits as its factorization.

21827386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550 (or 489 counting only the distinct ones).

The product of its digits is 32256, while the sum is 37.

The square root of 21827386 is about 4671.9788098835. The cubic root of 21827386 is about 279.4691728593.

The spelling of 21827386 in words is "twenty-one million, eight hundred twenty-seven thousand, three hundred eighty-six".