1312121003200 has 168 divisors, whose sum is σ = 3692296615392. Its totient is φ = 449574420480.

The previous prime is 1312121003153. The next prime is 1312121003203. The reversal of 1312121003200 is 23001212131.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (1312121003203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17355882 + ... + 17431318.

It is an arithmetic number, because the mean of its divisors is an integer number (21977956044).

Almost surely, 2^{1312121003200} is an apocalyptic number.

1312121003200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1312121003200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1846148307696).

1312121003200 is an abundant number, since it is smaller than the sum of its proper divisors (2380175612192).

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

1312121003200 is a wasteful number, since it uses less digits than its factorization.

1312121003200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77019 (or 77004 counting only the distinct ones).

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

Adding to 1312121003200 its reverse (23001212131), we get a palindrome (1335122215331).

The spelling of 1312121003200 in words is "one trillion, three hundred twelve billion, one hundred twenty-one million, three thousand, two hundred".