12271521 has 4 divisors (see below), whose sum is σ = 16362032. Its totient is φ = 8181012.

The previous prime is 12271517. The next prime is 12271537. The reversal of 12271521 is 12517221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12271521 - 2² = 12271517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12271541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2045251 + ... + 2045256.

It is an arithmetic number, because the mean of its divisors is an integer number (4090508).

Almost surely, 2^12271521 is an apocalyptic number.

It is an amenable number.

12271521 is a deficient number, since it is larger than the sum of its proper divisors (4090511).

12271521 is an equidigital number, since it uses as much as digits as its factorization.

12271521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4090510.

The product of its digits is 280, while the sum is 21.

The square root of 12271521 is about 3503.0730794547. The cubic root of 12271521 is about 230.6567304555.

Adding to 12271521 its reverse (12517221), we get a palindrome (24788742).

The spelling of 12271521 in words is "twelve million, two hundred seventy-one thousand, five hundred twenty-one".