21158388123163 has 2 divisors, whose sum is σ = 21158388123164. Its totient is φ = 21158388123162.

The previous prime is 21158388123143. The next prime is 21158388123167. The reversal of 21158388123163 is 36132188385112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21158388123163 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21158388123163.

It is not a weakly prime, because it can be changed into another prime (21158388123167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10579194061581 + 10579194061582.

It is an arithmetic number, because the mean of its divisors is an integer number (10579194061582).

Almost surely, 2^{21158388123163} is an apocalyptic number.

21158388123163 is a deficient number, since it is larger than the sum of its proper divisors (1).

21158388123163 is an equidigital number, since it uses as much as digits as its factorization.

21158388123163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1658880, while the sum is 52.

The spelling of 21158388123163 in words is "twenty-one trillion, one hundred fifty-eight billion, three hundred eighty-eight million, one hundred twenty-three thousand, one hundred sixty-three".