109755115621 has 2 divisors, whose sum is σ = 109755115622. Its totient is φ = 109755115620.

The previous prime is 109755115601. The next prime is 109755115751. The reversal of 109755115621 is 126511557901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77667558721 + 32087556900 = 278689^2 + 179130^2 .

It is a cyclic number.

It is not a de Polignac number, because 109755115621 - 2⁷ = 109755115493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109755115601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54877557810 + 54877557811.

It is an arithmetic number, because the mean of its divisors is an integer number (54877557811).

Almost surely, 2^109755115621 is an apocalyptic number.

It is an amenable number.

109755115621 is a deficient number, since it is larger than the sum of its proper divisors (1).

109755115621 is an equidigital number, since it uses as much as digits as its factorization.

109755115621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94500, while the sum is 43.

It can be divided in two parts, 1097551 and 15621, that multiplied together give a palindrome (17144844171).

The spelling of 109755115621 in words is "one hundred nine billion, seven hundred fifty-five million, one hundred fifteen thousand, six hundred twenty-one".