1312221 has 8 divisors (see below), whose sum is σ = 1810080. Its totient is φ = 844592.

The previous prime is 1312211. The next prime is 1312229. The reversal of 1312221 is 1222131.

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 1312221 - 2⁵ = 1312189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1312197 and 1312206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312229) 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, 7455 + ... + 7628.

It is an arithmetic number, because the mean of its divisors is an integer number (226260).

2^1312221 is an apocalyptic number.

It is an amenable number.

1312221 is a deficient number, since it is larger than the sum of its proper divisors (497859).

1312221 is a wasteful number, since it uses less digits than its factorization.

1312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15115.

The product of its digits is 24, while the sum is 12.

The square root of 1312221 is about 1145.5221516845. The cubic root of 1312221 is about 109.4802199421.

Adding to 1312221 its reverse (1222131), we get a palindrome (2534352).

The spelling of 1312221 in words is "one million, three hundred twelve thousand, two hundred twenty-one".