2001231143244 has 84 divisors (see below), whose sum is σ = 5252224081104. Its totient is φ = 666899907552.

The previous prime is 2001231143243. The next prime is 2001231143251. The reversal of 2001231143244 is 4423411321002.

2001231143244 is a `hidden beast` number, since 20 + 0 + 1 + 2 + 311 + 4 + 324 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (2001231143243) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 11128654 + ... + 11307050.

It is an arithmetic number, because the mean of its divisors is an integer number (62526477156).

Almost surely, 2^{2001231143244} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2001231143244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2626112040552).

2001231143244 is an abundant number, since it is smaller than the sum of its proper divisors (3250992937860).

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

2001231143244 is a wasteful number, since it uses less digits than its factorization.

2001231143244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182266 (or 182249 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 2001231143244 its reverse (4423411321002), we get a palindrome (6424642464246).

The spelling of 2001231143244 in words is "two trillion, one billion, two hundred thirty-one million, one hundred forty-three thousand, two hundred forty-four".