108520135480021 has 2 divisors, whose sum is σ = 108520135480022. Its totient is φ = 108520135480020.

The previous prime is 108520135480019. The next prime is 108520135480051. The reversal of 108520135480021 is 120084531025801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84561450232900 + 23958685247121 = 9195730^2 + 4894761^2 .

It is a cyclic number.

It is not a de Polignac number, because 108520135480021 - 2¹ = 108520135480019 is a prime.

It is a super-2 number, since 2×108520135480021² (a number of 29 digits) contains 22 as substring.

Together with 108520135480019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108520135480051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54260067740010 + 54260067740011.

It is an arithmetic number, because the mean of its divisors is an integer number (54260067740011).

Almost surely, 2^{108520135480021} is an apocalyptic number.

It is an amenable number.

108520135480021 is a deficient number, since it is larger than the sum of its proper divisors (1).

108520135480021 is an equidigital number, since it uses as much as digits as its factorization.

108520135480021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76800, while the sum is 40.

The spelling of 108520135480021 in words is "one hundred eight trillion, five hundred twenty billion, one hundred thirty-five million, four hundred eighty thousand, twenty-one".