21426382 has 12 divisors (see below), whose sum is σ = 32465160. Its totient is φ = 10605728.

The previous prime is 21426371. The next prime is 21426401. The reversal of 21426382 is 28362412.

It is a self number, because there is not a number n which added to its sum of digits gives 21426382.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 25119 + ... + 25957.

It is an arithmetic number, because the mean of its divisors is an integer number (2705430).

Almost surely, 2^21426382 is an apocalyptic number.

21426382 is a deficient number, since it is larger than the sum of its proper divisors (11038778).

21426382 is an equidigital number, since it uses as much as digits as its factorization.

21426382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067 (or 954 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The square root of 21426382 is about 4628.8640075077. The cubic root of 21426382 is about 277.7471520487.

Adding to 21426382 its reverse (28362412), we get a palindrome (49788794).

The spelling of 21426382 in words is "twenty-one million, four hundred twenty-six thousand, three hundred eighty-two".