2001231223134 has 64 divisors (see below), whose sum is σ = 4716147421440. Its totient is φ = 558123793920.

The previous prime is 2001231223133. The next prime is 2001231223139. The reversal of 2001231223134 is 4313221321002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001231223133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3171444 + ... + 3749735.

It is an arithmetic number, because the mean of its divisors is an integer number (73689803460).

Almost surely, 2^{2001231223134} is an apocalyptic number.

2001231223134 is an abundant number, since it is smaller than the sum of its proper divisors (2714916198306).

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

2001231223134 is a wasteful number, since it uses less digits than its factorization.

2001231223134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6921545.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 2001231223134 its reverse (4313221321002), we get a palindrome (6314452544136).

The spelling of 2001231223134 in words is "two trillion, one billion, two hundred thirty-one million, two hundred twenty-three thousand, one hundred thirty-four".