2005300021 has 2 divisors, whose sum is σ = 2005300022. Its totient is φ = 2005300020.

The previous prime is 2005300013. The next prime is 2005300049. The reversal of 2005300021 is 1200035002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1275489796 + 729810225 = 35714^2 + 27015^2 .

It is a cyclic number.

It is not a de Polignac number, because 2005300021 - 2³ = 2005300013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2005299974 and 2005300010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2005300081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1002650010 + 1002650011.

It is an arithmetic number, because the mean of its divisors is an integer number (1002650011).

Almost surely, 2^2005300021 is an apocalyptic number.

It is an amenable number.

2005300021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2005300021 is an equidigital number, since it uses as much as digits as its factorization.

2005300021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 2005300021 is about 44780.5763808373. The cubic root of 2005300021 is about 1261.0330029139.

Adding to 2005300021 its reverse (1200035002), we get a palindrome (3205335023).

The spelling of 2005300021 in words is "two billion, five million, three hundred thousand, twenty-one".