21513343301 has 2 divisors, whose sum is σ = 21513343302. Its totient is φ = 21513343300.

The previous prime is 21513343259. The next prime is 21513343337. The reversal of 21513343301 is 10334331512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21323592676 + 189750625 = 146026^2 + 13775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21513343301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21513343391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10756671650 + 10756671651.

It is an arithmetic number, because the mean of its divisors is an integer number (10756671651).

Almost surely, 2^21513343301 is an apocalyptic number.

It is an amenable number.

21513343301 is a deficient number, since it is larger than the sum of its proper divisors (1).

21513343301 is an equidigital number, since it uses as much as digits as its factorization.

21513343301 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 26.

Adding to 21513343301 its reverse (10334331512), we get a palindrome (31847674813).

The spelling of 21513343301 in words is "twenty-one billion, five hundred thirteen million, three hundred forty-three thousand, three hundred one".