2001343021 has 4 divisors (see below), whose sum is σ = 2001479200. Its totient is φ = 2001206844.

The previous prime is 2001343013. The next prime is 2001343027. The reversal of 2001343021 is 1203431002.

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 2001343021 - 2³ = 2001343013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001342986 and 2001343004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001343027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42951 + ... + 76468.

It is an arithmetic number, because the mean of its divisors is an integer number (500369800).

Almost surely, 2^2001343021 is an apocalyptic number.

It is an amenable number.

2001343021 is a deficient number, since it is larger than the sum of its proper divisors (136179).

2001343021 is a wasteful number, since it uses less digits than its factorization.

2001343021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136178.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 2001343021 is about 44736.3724613429. The cubic root of 2001343021 is about 1260.2030035307.

Adding to 2001343021 its reverse (1203431002), we get a palindrome (3204774023).

The spelling of 2001343021 in words is "two billion, one million, three hundred forty-three thousand, twenty-one".