21473126 has 4 divisors (see below), whose sum is σ = 32209692. Its totient is φ = 10736562.

The previous prime is 21473107. The next prime is 21473147. The reversal of 21473126 is 62137412.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21473126² = 922190280423752, which contains 22 as substring.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 21473095 and 21473104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5368280 + ... + 5368283.

It is an arithmetic number, because the mean of its divisors is an integer number (8052423).

Almost surely, 2^21473126 is an apocalyptic number.

21473126 is a deficient number, since it is larger than the sum of its proper divisors (10736566).

21473126 is a wasteful number, since it uses less digits than its factorization.

21473126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10736565.

The product of its digits is 2016, while the sum is 26.

The square root of 21473126 is about 4633.9104436750. The cubic root of 21473126 is about 277.9489839619.

The spelling of 21473126 in words is "twenty-one million, four hundred seventy-three thousand, one hundred twenty-six".