21473255 has 8 divisors (see below), whose sum is σ = 25804224. Its totient is φ = 17154400.

The previous prime is 21473239. The next prime is 21473267. The reversal of 21473255 is 55237412.

It is a happy number.

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

It is not a de Polignac number, because 21473255 - 2⁴ = 21473239 is a prime.

It is a super-2 number, since 2×21473255² = 922201360590050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1490 + ... + 6720.

It is an arithmetic number, because the mean of its divisors is an integer number (3225528).

Almost surely, 2^21473255 is an apocalyptic number.

21473255 is a deficient number, since it is larger than the sum of its proper divisors (4330969).

21473255 is an equidigital number, since it uses as much as digits as its factorization.

21473255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6057.

The product of its digits is 8400, while the sum is 29.

The square root of 21473255 is about 4633.9243627837. The cubic root of 21473255 is about 277.9495405545.

The spelling of 21473255 in words is "twenty-one million, four hundred seventy-three thousand, two hundred fifty-five".