1331243203212 has 144 divisors (see below), whose sum is σ = 3815461628160. Its totient is φ = 387974530944.

The previous prime is 1331243203183. The next prime is 1331243203219. The reversal of 1331243203212 is 2123023421331.

1331243203212 is a `hidden beast` number, since 1 + 3 + 3 + 1 + 243 + 203 + 212 = 666.

It is not an unprimeable number, because it can be changed into a prime (1331243203219) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53401783 + ... + 53426705.

Almost surely, 2^{1331243203212} is an apocalyptic number.

1331243203212 is a gapful number since it is divisible by the number (12) 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 1331243203212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1907730814080).

1331243203212 is an abundant number, since it is smaller than the sum of its proper divisors (2484218424948).

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

1331243203212 is a wasteful number, since it uses less digits than its factorization.

1331243203212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30972 (or 30967 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

Adding to 1331243203212 its reverse (2123023421331), we get a palindrome (3454266624543).

The spelling of 1331243203212 in words is "one trillion, three hundred thirty-one billion, two hundred forty-three million, two hundred three thousand, two hundred twelve".