2000021321 has 6 divisors (see below), whose sum is σ = 2124590430. Its totient is φ = 1882372736.

The previous prime is 2000021311. The next prime is 2000021323. The reversal of 2000021321 is 1231200002.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 346704400 + 1653316921 = 18620^2 + 40661^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2000021321 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2000021323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3459956 + ... + 3460533.

It is an arithmetic number, because the mean of its divisors is an integer number (354098405).

Almost surely, 2^2000021321 is an apocalyptic number.

It is an amenable number.

2000021321 is a deficient number, since it is larger than the sum of its proper divisors (124569109).

2000021321 is an equidigital number, since it uses as much as digits as its factorization.

2000021321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6920523 (or 6920506 counting only the distinct ones).

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

The square root of 2000021321 is about 44721.5979253872. The cubic root of 2000021321 is about 1259.9255270084.

Adding to 2000021321 its reverse (1231200002), we get a palindrome (3231221323).

The spelling of 2000021321 in words is "two billion, twenty-one thousand, three hundred twenty-one".