21630043323613 has 2 divisors, whose sum is σ = 21630043323614. Its totient is φ = 21630043323612.

The previous prime is 21630043323593. The next prime is 21630043323649. The reversal of 21630043323613 is 31632334003612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20101709481049 + 1528333842564 = 4483493^2 + 1236258^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21630043323613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21630043323653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10815021661806 + 10815021661807.

It is an arithmetic number, because the mean of its divisors is an integer number (10815021661807).

Almost surely, 2^{21630043323613} is an apocalyptic number.

It is an amenable number.

21630043323613 is a deficient number, since it is larger than the sum of its proper divisors (1).

21630043323613 is an equidigital number, since it uses as much as digits as its factorization.

21630043323613 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 37.

The spelling of 21630043323613 in words is "twenty-one trillion, six hundred thirty billion, forty-three million, three hundred twenty-three thousand, six hundred thirteen".