1312100220321 has 24 divisors (see below), whose sum is σ = 2067648092640. Its totient is φ = 795175243200.

The previous prime is 1312100220313. The next prime is 1312100220323. The reversal of 1312100220321 is 1230220012131.

1312100220321 is a `hidden beast` number, since 1 + 3 + 121 + 0 + 0 + 220 + 321 = 666.

It is not a de Polignac number, because 1312100220321 - 2³ = 1312100220313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1312100220294 and 1312100220303.

It is not an unprimeable number, because it can be changed into a prime (1312100220323) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1909525 + ... + 2504093.

It is an arithmetic number, because the mean of its divisors is an integer number (86152003860).

Almost surely, 2^{1312100220321} is an apocalyptic number.

1312100220321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1312100220321 is a deficient number, since it is larger than the sum of its proper divisors (755547872319).

1312100220321 is a wasteful number, since it uses less digits than its factorization.

1312100220321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616877 (or 616874 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1312100220321 its reverse (1230220012131), we get a palindrome (2542320232452).

The spelling of 1312100220321 in words is "one trillion, three hundred twelve billion, one hundred million, two hundred twenty thousand, three hundred twenty-one".