21473008 has 10 divisors (see below), whose sum is σ = 41603984. Its totient is φ = 10736496.

The previous prime is 21472999. The next prime is 21473009. The reversal of 21473008 is 80037412.

It is a super-2 number, since 2×21473008² = 922180145136128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21473009) 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 as a sum of consecutive naturals, namely, 671016 + ... + 671047.

Almost surely, 2^21473008 is an apocalyptic number.

It is an amenable number.

21473008 is a deficient number, since it is larger than the sum of its proper divisors (20130976).

21473008 is a wasteful number, since it uses less digits than its factorization.

21473008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342071 (or 1342065 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 21473008 is about 4633.8977114304. The cubic root of 21473008 is about 277.9484748288.

The spelling of 21473008 in words is "twenty-one million, four hundred seventy-three thousand, eight".