2001302021 has 4 divisors (see below), whose sum is σ = 2019662700. Its totient is φ = 1982941344.

The previous prime is 2001302003. The next prime is 2001302029. The reversal of 2001302021 is 1202031002.

It is a happy number.

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 1406625025 + 594676996 = 37505^2 + 24386^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001302021 - 2⁶ = 2001301957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001301993 and 2001302011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001302029) 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, 9180176 + ... + 9180393.

It is an arithmetic number, because the mean of its divisors is an integer number (504915675).

Almost surely, 2^2001302021 is an apocalyptic number.

It is an amenable number.

2001302021 is a deficient number, since it is larger than the sum of its proper divisors (18360679).

2001302021 is a wasteful number, since it uses less digits than its factorization.

2001302021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18360678.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 2001302021 is about 44735.9142188913. The cubic root of 2001302021 is about 1260.1943978635.

Adding to 2001302021 its reverse (1202031002), we get a palindrome (3203333023).

The spelling of 2001302021 in words is "two billion, one million, three hundred two thousand, twenty-one".