21473104 has 10 divisors (see below), whose sum is σ = 41604170. Its totient is φ = 10736544.

The previous prime is 21473093. The next prime is 21473107. The reversal of 21473104 is 40137412.

It can be written as a sum of positive squares in only one way, i.e., 14440000 + 7033104 = 3800^2 + 2652^2 .

It is a super-2 number, since 2×21473104² = 922188390789632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21473107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 671019 + ... + 671050.

It is an arithmetic number, because the mean of its divisors is an integer number (4160417).

Almost surely, 2^21473104 is an apocalyptic number.

It is an amenable number.

21473104 is a deficient number, since it is larger than the sum of its proper divisors (20131066).

21473104 is a wasteful number, since it uses less digits than its factorization.

21473104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1342077 (or 1342071 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21473104 is about 4633.9080698693. The cubic root of 21473104 is about 277.9488890389.

The spelling of 21473104 in words is "twenty-one million, four hundred seventy-three thousand, one hundred four".