2013320521 has 2 divisors, whose sum is σ = 2013320522. Its totient is φ = 2013320520.

The previous prime is 2013320483. The next prime is 2013320527. The reversal of 2013320521 is 1250233102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1658525625 + 354794896 = 40725^2 + 18836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2013320521 is a prime.

It is a super-2 number, since 2×2013320521² = 8106919040559422882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2013320527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1006660260 + 1006660261.

It is an arithmetic number, because the mean of its divisors is an integer number (1006660261).

Almost surely, 2^2013320521 is an apocalyptic number.

It is an amenable number.

2013320521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2013320521 is an equidigital number, since it uses as much as digits as its factorization.

2013320521 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 19.

The square root of 2013320521 is about 44870.0403498816. The cubic root of 2013320521 is about 1262.7119970241.

Adding to 2013320521 its reverse (1250233102), we get a palindrome (3263553623).

It can be divided in two parts, 20 and 13320521, that added together give a triangular number (13320541 = T₅₁₆₁).

The spelling of 2013320521 in words is "two billion, thirteen million, three hundred twenty thousand, five hundred twenty-one".