21010162813 has 2 divisors, whose sum is σ = 21010162814. Its totient is φ = 21010162812.

The previous prime is 21010162763. The next prime is 21010162837. The reversal of 21010162813 is 31826101012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19532298564 + 1477864249 = 139758^2 + 38443^2 .

It is a cyclic number.

It is not a de Polignac number, because 21010162813 - 2³³ = 12420228221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010168813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505081406 + 10505081407.

It is an arithmetic number, because the mean of its divisors is an integer number (10505081407).

Almost surely, 2^21010162813 is an apocalyptic number.

It is an amenable number.

21010162813 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010162813 is an equidigital number, since it uses as much as digits as its factorization.

21010162813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 25.

Adding to 21010162813 its reverse (31826101012), we get a palindrome (52836263825).

The spelling of 21010162813 in words is "twenty-one billion, ten million, one hundred sixty-two thousand, eight hundred thirteen".