21130242013 has 2 divisors, whose sum is σ = 21130242014. Its totient is φ = 21130242012.

The previous prime is 21130241989. The next prime is 21130242113. The reversal of 21130242013 is 31024203112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20501085124 + 629156889 = 143182^2 + 25083^2 .

It is a cyclic number.

It is not a de Polignac number, because 21130242013 - 2⁹ = 21130241501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21130242113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565121006 + 10565121007.

It is an arithmetic number, because the mean of its divisors is an integer number (10565121007).

Almost surely, 2^21130242013 is an apocalyptic number.

It is an amenable number.

21130242013 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130242013 is an equidigital number, since it uses as much as digits as its factorization.

21130242013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21130242013 its reverse (31024203112), we get a palindrome (52154445125).

The spelling of 21130242013 in words is "twenty-one billion, one hundred thirty million, two hundred forty-two thousand, thirteen".