109693321220981 has 2 divisors, whose sum is σ = 109693321220982. Its totient is φ = 109693321220980.

The previous prime is 109693321220953. The next prime is 109693321221041. The reversal of 109693321220981 is 189022123396901.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93738529241956 + 15954791979025 = 9681866^2 + 3994345^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109693321220981 is a prime.

It is a super-2 number, since 2×109693321220981² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109693321220381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54846660610490 + 54846660610491.

It is an arithmetic number, because the mean of its divisors is an integer number (54846660610491).

Almost surely, 2^{109693321220981} is an apocalyptic number.

It is an amenable number.

109693321220981 is a deficient number, since it is larger than the sum of its proper divisors (1).

109693321220981 is an equidigital number, since it uses as much as digits as its factorization.

109693321220981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2519424, while the sum is 56.

The spelling of 109693321220981 in words is "one hundred nine trillion, six hundred ninety-three billion, three hundred twenty-one million, two hundred twenty thousand, nine hundred eighty-one".