1312033221 has 20 divisors (see below), whose sum is σ = 1967216064. Its totient is φ = 871446600.

The previous prime is 1312033213. The next prime is 1312033223. The reversal of 1312033221 is 1223302131.

1312033221 is a `hidden beast` number, since 1 + 312 + 0 + 332 + 21 = 666.

It is not a de Polignac number, because 1312033221 - 2³ = 1312033213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1312033194 and 1312033203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312033223) 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 19 ways as a sum of consecutive naturals, for example, 7935 + ... + 51836.

Almost surely, 2^1312033221 is an apocalyptic number.

It is an amenable number.

1312033221 is a deficient number, since it is larger than the sum of its proper divisors (655182843).

1312033221 is an equidigital number, since it uses as much as digits as its factorization.

1312033221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60054 (or 60045 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 1312033221 is about 36221.9991303628. Note that the first 3 decimals coincide. The cubic root of 1312033221 is about 1094.7499748161.

Adding to 1312033221 its reverse (1223302131), we get a palindrome (2535335352).

The spelling of 1312033221 in words is "one billion, three hundred twelve million, thirty-three thousand, two hundred twenty-one".