21473336 has 16 divisors (see below), whose sum is σ = 40362000. Its totient is φ = 10710144.

The previous prime is 21473293. The next prime is 21473351. The reversal of 21473336 is 63337412.

It is a happy number.

It is a super-3 number, since 3×21473336³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 21473299 and 21473308.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 365 + ... + 6563.

It is an arithmetic number, because the mean of its divisors is an integer number (2522625).

Almost surely, 2^21473336 is an apocalyptic number.

It is an amenable number.

21473336 is a deficient number, since it is larger than the sum of its proper divisors (18888664).

21473336 is a wasteful number, since it uses less digits than its factorization.

21473336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6638 (or 6634 counting only the distinct ones).

The product of its digits is 9072, while the sum is 29.

The square root of 21473336 is about 4633.9331026678. The cubic root of 21473336 is about 277.9498900417.

The spelling of 21473336 in words is "twenty-one million, four hundred seventy-three thousand, three hundred thirty-six".