21145415413 has 2 divisors, whose sum is σ = 21145415414. Its totient is φ = 21145415412.

The previous prime is 21145415387. The next prime is 21145415441. The reversal of 21145415413 is 31451454112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12776459089 + 8368956324 = 113033^2 + 91482^2 .

It is a cyclic number.

It is not a de Polignac number, because 21145415413 - 2¹³ = 21145407221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21145415443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10572707706 + 10572707707.

It is an arithmetic number, because the mean of its divisors is an integer number (10572707707).

Almost surely, 2^21145415413 is an apocalyptic number.

It is an amenable number.

21145415413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21145415413 is an equidigital number, since it uses as much as digits as its factorization.

21145415413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9600, while the sum is 31.

Adding to 21145415413 its reverse (31451454112), we get a palindrome (52596869525).

The spelling of 21145415413 in words is "twenty-one billion, one hundred forty-five million, four hundred fifteen thousand, four hundred thirteen".