2001254144521 has 4 divisors (see below), whose sum is σ = 2004771287700. Its totient is φ = 1997737001344.

The previous prime is 2001254144507. The next prime is 2001254144551. The reversal of 2001254144521 is 1254414521002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1261027932025 + 740226212496 = 1122955^2 + 860364^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001254144521 - 2⁹ = 2001254144009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001254144551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1758570736 + ... + 1758571873.

It is an arithmetic number, because the mean of its divisors is an integer number (501192821925).

Almost surely, 2^{2001254144521} is an apocalyptic number.

It is an amenable number.

2001254144521 is a deficient number, since it is larger than the sum of its proper divisors (3517143179).

2001254144521 is an equidigital number, since it uses as much as digits as its factorization.

2001254144521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3517143178.

The product of its (nonzero) digits is 12800, while the sum is 31.

Adding to 2001254144521 its reverse (1254414521002), we get a palindrome (3255668665523).

The spelling of 2001254144521 in words is "two trillion, one billion, two hundred fifty-four million, one hundred forty-four thousand, five hundred twenty-one".