1312320221228 has 12 divisors (see below), whose sum is σ = 2296569039072. Its totient is φ = 656157638640.

The previous prime is 1312320221221. The next prime is 1312320221239. The reversal of 1312320221228 is 8221220232131.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1312320221228.

It is not an unprimeable number, because it can be changed into a prime (1312320221221) 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, 1118858 + ... + 1968878.

It is an arithmetic number, because the mean of its divisors is an integer number (191380753256).

Almost surely, 2^{1312320221228} is an apocalyptic number.

It is an amenable number.

1312320221228 is a deficient number, since it is larger than the sum of its proper divisors (984248817844).

1312320221228 is a wasteful number, since it uses less digits than its factorization.

1312320221228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235992 (or 1235990 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 1312320221228 its reverse (8221220232131), we get a palindrome (9533540453359).

The spelling of 1312320221228 in words is "one trillion, three hundred twelve billion, three hundred twenty million, two hundred twenty-one thousand, two hundred twenty-eight".