21473404 has 12 divisors (see below), whose sum is σ = 38215800. Its totient is φ = 10554608.

The previous prime is 21473393. The next prime is 21473423. The reversal of 21473404 is 40437412.

It is a super-2 number, since 2×21473404² = 922214158694432, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 45259 + ... + 45730.

It is an arithmetic number, because the mean of its divisors is an integer number (3184650).

Almost surely, 2^21473404 is an apocalyptic number.

It is an amenable number.

21473404 is a deficient number, since it is larger than the sum of its proper divisors (16742396).

21473404 is a wasteful number, since it uses less digits than its factorization.

21473404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91052 (or 91050 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 21473404 is about 4633.9404398417. The cubic root of 21473404 is about 277.9501834377.

The spelling of 21473404 in words is "twenty-one million, four hundred seventy-three thousand, four hundred four".