21134242513 has 2 divisors, whose sum is σ = 21134242514. Its totient is φ = 21134242512.

The previous prime is 21134242501. The next prime is 21134242523. The reversal of 21134242513 is 31524243112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18651911184 + 2482331329 = 136572^2 + 49823^2 .

It is a cyclic number.

It is not a de Polignac number, because 21134242513 - 2¹³ = 21134234321 is a prime.

It is not a weakly prime, because it can be changed into another prime (21134242523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10567121256 + 10567121257.

It is an arithmetic number, because the mean of its divisors is an integer number (10567121257).

Almost surely, 2^21134242513 is an apocalyptic number.

It is an amenable number.

21134242513 is a deficient number, since it is larger than the sum of its proper divisors (1).

21134242513 is an equidigital number, since it uses as much as digits as its factorization.

21134242513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 28.

Adding to 21134242513 its reverse (31524243112), we get a palindrome (52658485625).

The spelling of 21134242513 in words is "twenty-one billion, one hundred thirty-four million, two hundred forty-two thousand, five hundred thirteen".