21473753 has 8 divisors (see below), whose sum is σ = 24878208. Its totient is φ = 18153504.

The previous prime is 21473747. The next prime is 21473773. The reversal of 21473753 is 35737412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21473753 - 2⁸ = 21473497 is a prime.

It is a super-2 number, since 2×21473753² = 922244135810018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21473773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20501 + ... + 21522.

It is an arithmetic number, because the mean of its divisors is an integer number (3109776).

Almost surely, 2^21473753 is an apocalyptic number.

It is an amenable number.

21473753 is a deficient number, since it is larger than the sum of its proper divisors (3404455).

21473753 is an equidigital number, since it uses as much as digits as its factorization.

21473753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42103.

The product of its digits is 17640, while the sum is 32.

The square root of 21473753 is about 4633.9780966250. The cubic root of 21473753 is about 277.9516892398.

The spelling of 21473753 in words is "twenty-one million, four hundred seventy-three thousand, seven hundred fifty-three".