2001224451 has 4 divisors (see below), whose sum is σ = 2668299272. Its totient is φ = 1334149632.

The previous prime is 2001224443. The next prime is 2001224453. The reversal of 2001224451 is 1544221002.

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

It is not a de Polignac number, because 2001224451 - 2³ = 2001224443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001224453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333537406 + ... + 333537411.

It is an arithmetic number, because the mean of its divisors is an integer number (667074818).

Almost surely, 2^2001224451 is an apocalyptic number.

2001224451 is a deficient number, since it is larger than the sum of its proper divisors (667074821).

2001224451 is an equidigital number, since it uses as much as digits as its factorization.

2001224451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667074820.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 2001224451 is about 44735.0472336847. The cubic root of 2001224451 is about 1260.1781160394.

Adding to 2001224451 its reverse (1544221002), we get a palindrome (3545445453).

The spelling of 2001224451 in words is "two billion, one million, two hundred twenty-four thousand, four hundred fifty-one".