108921781019 has 2 divisors, whose sum is σ = 108921781020. Its totient is φ = 108921781018.

The previous prime is 108921780997. The next prime is 108921781027. The reversal of 108921781019 is 910187129801.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-108921781019 is a prime.

It is a super-2 number, since 2×108921781019² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (108921781039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54460890509 + 54460890510.

It is an arithmetic number, because the mean of its divisors is an integer number (54460890510).

Almost surely, 2^108921781019 is an apocalyptic number.

108921781019 is a deficient number, since it is larger than the sum of its proper divisors (1).

108921781019 is an equidigital number, since it uses as much as digits as its factorization.

108921781019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 47.

The spelling of 108921781019 in words is "one hundred eight billion, nine hundred twenty-one million, seven hundred eighty-one thousand, nineteen".