2001231121012 has 12 divisors (see below), whose sum is σ = 3503094159040. Its totient is φ = 1000347075576.

The previous prime is 2001231120989. The next prime is 2001231121013. The reversal of 2001231121012 is 2101211321002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001231121013) 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, 67104462 + ... + 67134277.

Almost surely, 2^{2001231121012} is an apocalyptic number.

It is an amenable number.

2001231121012 is a deficient number, since it is larger than the sum of its proper divisors (1501863038028).

2001231121012 is a wasteful number, since it uses less digits than its factorization.

2001231121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134242470 (or 134242468 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 2001231121012 its reverse (2101211321002), we get a palindrome (4102442442014).

The spelling of 2001231121012 in words is "two trillion, one billion, two hundred thirty-one million, one hundred twenty-one thousand, twelve".