2013321521 has 2 divisors, whose sum is σ = 2013321522. Its totient is φ = 2013321520.

The previous prime is 2013321517. The next prime is 2013321539. The reversal of 2013321521 is 1251233102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1983455296 + 29866225 = 44536^2 + 5465^2 .

It is a cyclic number.

It is not a de Polignac number, because 2013321521 - 2² = 2013321517 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2013321493 and 2013321502.

It is not a weakly prime, because it can be changed into another prime (2013320521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1006660760 + 1006660761.

It is an arithmetic number, because the mean of its divisors is an integer number (1006660761).

Almost surely, 2^2013321521 is an apocalyptic number.

It is an amenable number.

2013321521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2013321521 is an equidigital number, since it uses as much as digits as its factorization.

2013321521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 2013321521 is about 44870.0514931730. The cubic root of 2013321521 is about 1262.7122060836.

Adding to 2013321521 its reverse (1251233102), we get a palindrome (3264554623).

The spelling of 2013321521 in words is "two billion, thirteen million, three hundred twenty-one thousand, five hundred twenty-one".