2001233021 has 4 divisors (see below), whose sum is σ = 2005309344. Its totient is φ = 1997156700.

The previous prime is 2001232991. The next prime is 2001233027. The reversal of 2001233021 is 1203321002.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2001233021 - 2¹⁸ = 2000970877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001232987 and 2001233005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001233027) 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 3 ways as a sum of consecutive naturals, for example, 2037425 + ... + 2038406.

It is an arithmetic number, because the mean of its divisors is an integer number (501327336).

Almost surely, 2^2001233021 is an apocalyptic number.

It is an amenable number.

2001233021 is a deficient number, since it is larger than the sum of its proper divisors (4076323).

2001233021 is an equidigital number, since it uses as much as digits as its factorization.

2001233021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4076322.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 2001233021 is about 44735.1430197781. The cubic root of 2001233021 is about 1260.1799148900.

Adding to 2001233021 its reverse (1203321002), we get a palindrome (3204554023).

The spelling of 2001233021 in words is "two billion, one million, two hundred thirty-three thousand, twenty-one".