1312221443 has 4 divisors (see below), whose sum is σ = 1413161568. Its totient is φ = 1211281320.

The previous prime is 1312221439. The next prime is 1312221479. The reversal of 1312221443 is 3441222131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3441222131 = 18617 ⋅184843.

It is a cyclic number.

It is not a de Polignac number, because 1312221443 - 2² = 1312221439 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1312221403) 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, 50470043 + ... + 50470068.

It is an arithmetic number, because the mean of its divisors is an integer number (353290392).

Almost surely, 2^1312221443 is an apocalyptic number.

1312221443 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1312221443 is a deficient number, since it is larger than the sum of its proper divisors (100940125).

1312221443 is a wasteful number, since it uses less digits than its factorization.

1312221443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100940124.

The product of its digits is 1152, while the sum is 23.

The square root of 1312221443 is about 36224.5972096309. The cubic root of 1312221443 is about 1094.8023226210.

Adding to 1312221443 its reverse (3441222131), we get a palindrome (4753443574).

The spelling of 1312221443 in words is "one billion, three hundred twelve million, two hundred twenty-one thousand, four hundred forty-three".