Search a number
21040271 = 717176809
BaseRepresentation
bin101000001000…
…0110010001111
31110120221211022
41100100302033
520341242041
62030544355
7343560620
oct120206217
943527738
1021040271
111097095a
1270680bb
134488a85
142b19a47
151ca924b
hex1410c8f

21040271 has 8 divisors (see below), whose sum is σ = 25460640. Its totient is φ = 16973568.

The previous prime is 21040267. The next prime is 21040297. The reversal of 21040271 is 17204012.

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 21040271 - 22 = 21040267 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21040231) 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, 88286 + ... + 88523.

It is an arithmetic number, because the mean of its divisors is an integer number (3182580).

Almost surely, 221040271 is an apocalyptic number.

21040271 is a deficient number, since it is larger than the sum of its proper divisors (4420369).

21040271 is a wasteful number, since it uses less digits than its factorization.

21040271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176833.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 21040271 is about 4586.9675167806. The cubic root of 21040271 is about 276.0686615913.

Adding to 21040271 its reverse (17204012), we get a palindrome (38244283).

The spelling of 21040271 in words is "twenty-one million, forty thousand, two hundred seventy-one".

Divisors: 1 7 17 119 176809 1237663 3005753 21040271