21048271 has 4 divisors (see below), whose sum is σ = 21062032. Its totient is φ = 21034512.

The previous prime is 21048263. The next prime is 21048281. The reversal of 21048271 is 17284012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21048271 - 2³ = 21048263 is a prime.

It is a super-3 number, since 3×21048271³ (a number of 23 digits) contains 333 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 (21048221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4251 + ... + 7756.

It is an arithmetic number, because the mean of its divisors is an integer number (5265508).

Almost surely, 2^21048271 is an apocalyptic number.

21048271 is a deficient number, since it is larger than the sum of its proper divisors (13761).

21048271 is a wasteful number, since it uses less digits than its factorization.

21048271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13760.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 21048271 is about 4587.8394697286. The cubic root of 21048271 is about 276.1036463980.

The spelling of 21048271 in words is "twenty-one million, forty-eight thousand, two hundred seventy-one".