21504482 has 4 divisors (see below), whose sum is σ = 32256726. Its totient is φ = 10752240.

The previous prime is 21504463. The next prime is 21504533. The reversal of 21504482 is 28440512.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 10883401 + 10621081 = 3299^2 + 3259^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5376119 + ... + 5376122.

Almost surely, 2^21504482 is an apocalyptic number.

21504482 is a deficient number, since it is larger than the sum of its proper divisors (10752244).

21504482 is a wasteful number, since it uses less digits than its factorization.

21504482 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10752243.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 21504482 is about 4637.2925290518. The cubic root of 21504482 is about 278.0842092600.

Adding to 21504482 its reverse (28440512), we get a palindrome (49944994).

The spelling of 21504482 in words is "twenty-one million, five hundred four thousand, four hundred eighty-two".