1243131211012 has 24 divisors (see below), whose sum is σ = 2197909190232. Its totient is φ = 615162144000.

The previous prime is 1243131210977. The next prime is 1243131211013. The reversal of 1243131211012 is 2101121313421.

It can be written as a sum of positive squares in 4 ways, for example, as 963114555456 + 280016655556 = 981384^2 + 529166^2 .

It is not an unprimeable number, because it can be changed into a prime (1243131211013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376962 + ... + 1621222.

It is an arithmetic number, because the mean of its divisors is an integer number (91579549593).

Almost surely, 2^{1243131211012} is an apocalyptic number.

It is an amenable number.

1243131211012 is a deficient number, since it is larger than the sum of its proper divisors (954777979220).

1243131211012 is a wasteful number, since it uses less digits than its factorization.

1243131211012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1246839 (or 1246837 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 1243131211012 its reverse (2101121313421), we get a palindrome (3344252524433).

The spelling of 1243131211012 in words is "one trillion, two hundred forty-three billion, one hundred thirty-one million, two hundred eleven thousand, twelve".