1271221 has 4 divisors (see below), whose sum is σ = 1452832. Its totient is φ = 1089612.

The previous prime is 1271213. The next prime is 1271227. The reversal of 1271221 is 1221721.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1221721 = 331 ⋅3691.

It is a cyclic number.

It is not a de Polignac number, because 1271221 - 2³ = 1271213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1271195 and 1271204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271227) 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, 90795 + ... + 90808.

It is an arithmetic number, because the mean of its divisors is an integer number (363208).

2^1271221 is an apocalyptic number.

It is an amenable number.

1271221 is a deficient number, since it is larger than the sum of its proper divisors (181611).

1271221 is an equidigital number, since it uses as much as digits as its factorization.

1271221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181610.

The product of its digits is 56, while the sum is 16.

The square root of 1271221 is about 1127.4843679626. The cubic root of 1271221 is about 108.3279071575.

Adding to 1271221 its reverse (1221721), we get a palindrome (2492942).

The spelling of 1271221 in words is "one million, two hundred seventy-one thousand, two hundred twenty-one".