1312200103021 has 4 divisors (see below), whose sum is σ = 1330175446972. Its totient is φ = 1294224759072.

The previous prime is 1312200103009. The next prime is 1312200103031. The reversal of 1312200103021 is 1203010022131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1086470590921 + 225729512100 = 1042339^2 + 475110^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312200103021 - 2¹⁹ = 1312199578733 is a prime.

It is a super-2 number, since 2×1312200103021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312200102986 and 1312200103004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312200103031) 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, 8987671866 + ... + 8987672011.

It is an arithmetic number, because the mean of its divisors is an integer number (332543861743).

Almost surely, 2^{1312200103021} is an apocalyptic number.

It is an amenable number.

1312200103021 is a deficient number, since it is larger than the sum of its proper divisors (17975343951).

1312200103021 is an equidigital number, since it uses as much as digits as its factorization.

1312200103021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17975343950.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 1312200103021 its reverse (1203010022131), we get a palindrome (2515210125152).

The spelling of 1312200103021 in words is "one trillion, three hundred twelve billion, two hundred million, one hundred three thousand, twenty-one".