21471263 has 8 divisors (see below), whose sum is σ = 23466576. Its totient is φ = 19483200.

The previous prime is 21471257. The next prime is 21471283. The reversal of 21471263 is 36217412.

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

It is not a de Polignac number, because 21471263 - 2⁶ = 21471199 is a prime.

It is a super-2 number, since 2×21471263² = 922030269630338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21471283) 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, 5795 + ... + 8747.

It is an arithmetic number, because the mean of its divisors is an integer number (2933322).

Almost surely, 2^21471263 is an apocalyptic number.

21471263 is a deficient number, since it is larger than the sum of its proper divisors (1995313).

21471263 is a wasteful number, since it uses less digits than its factorization.

21471263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3625.

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

The square root of 21471263 is about 4633.7094211873. The cubic root of 21471263 is about 277.9409454811.

Adding to 21471263 its reverse (36217412), we get a palindrome (57688675).

The spelling of 21471263 in words is "twenty-one million, four hundred seventy-one thousand, two hundred sixty-three".