21522382 has 16 divisors (see below), whose sum is σ = 37893600. Its totient is φ = 8974368.

The previous prime is 21522373. The next prime is 21522427. The reversal of 21522382 is 28322512.

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 7 ways as a sum of consecutive naturals, for example, 20257 + ... + 21292.

It is an arithmetic number, because the mean of its divisors is an integer number (2368350).

Almost surely, 2^21522382 is an apocalyptic number.

21522382 is a deficient number, since it is larger than the sum of its proper divisors (16371218).

21522382 is a wasteful number, since it uses less digits than its factorization.

21522382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41595.

The product of its digits is 1920, while the sum is 25.

The square root of 21522382 is about 4639.2221330736. Note that the first 3 decimals coincide. The cubic root of 21522382 is about 278.1613455342.

Adding to 21522382 its reverse (28322512), we get a palindrome (49844894).

It can be divided in two parts, 21522 and 382, that added together give a square (21904 = 148²).

The spelling of 21522382 in words is "twenty-one million, five hundred twenty-two thousand, three hundred eighty-two".