21472504 has 8 divisors (see below), whose sum is σ = 40260960. Its totient is φ = 10736248.

The previous prime is 21472483. The next prime is 21472531. The reversal of 21472504 is 40527412.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21472504² = 922136856060032, which contains 22 as substring.

It is a plaindrome in base 11.

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 as a sum of consecutive naturals, namely, 1342024 + ... + 1342039.

It is an arithmetic number, because the mean of its divisors is an integer number (5032620).

Almost surely, 2^21472504 is an apocalyptic number.

It is an amenable number.

21472504 is a deficient number, since it is larger than the sum of its proper divisors (18788456).

21472504 is a wasteful number, since it uses less digits than its factorization.

21472504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2684069 (or 2684065 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 21472504 is about 4633.8433292463. The cubic root of 21472504 is about 277.9463002052.

Adding to 21472504 its reverse (40527412), we get a palindrome (61999916).

The spelling of 21472504 in words is "twenty-one million, four hundred seventy-two thousand, five hundred four".