1312123213220 has 12 divisors (see below), whose sum is σ = 2755458747804. Its totient is φ = 524849285280.

The previous prime is 1312123213207. The next prime is 1312123213229. The reversal of 1312123213220 is 223123212131.

It can be written as a sum of positive squares in 2 ways, for example, as 625124259904 + 686998953316 = 790648^2 + 828854^2 .

It is not an unprimeable number, because it can be changed into a prime (1312123213229) 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, 32803080311 + ... + 32803080350.

It is an arithmetic number, because the mean of its divisors is an integer number (229621562317).

Almost surely, 2^{1312123213220} is an apocalyptic number.

1312123213220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312123213220 is an abundant number, since it is smaller than the sum of its proper divisors (1443335534584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1312123213220 is a wasteful number, since it uses less digits than its factorization.

1312123213220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65606160670 (or 65606160668 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1312123213220 its reverse (223123212131), we get a palindrome (1535246425351).

The spelling of 1312123213220 in words is "one trillion, three hundred twelve billion, one hundred twenty-three million, two hundred thirteen thousand, two hundred twenty".