2001122445 has 64 divisors (see below), whose sum is σ = 3896709120. Its totient is φ = 856040448.

The previous prime is 2001122443. The next prime is 2001122483. The reversal of 2001122445 is 5442211002.

It is not a de Polignac number, because 2001122445 - 2¹ = 2001122443 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001122441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 316384 + ... + 322646.

It is an arithmetic number, because the mean of its divisors is an integer number (60886080).

Almost surely, 2^2001122445 is an apocalyptic number.

It is an amenable number.

2001122445 is a deficient number, since it is larger than the sum of its proper divisors (1895586675).

2001122445 is a wasteful number, since it uses less digits than its factorization.

2001122445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6474.

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

The square root of 2001122445 is about 44733.9071063550. The cubic root of 2001122445 is about 1260.1567044960.

Adding to 2001122445 its reverse (5442211002), we get a palindrome (7443333447).

The spelling of 2001122445 in words is "two billion, one million, one hundred twenty-two thousand, four hundred forty-five".