111742402021517 has 2 divisors, whose sum is σ = 111742402021518. Its totient is φ = 111742402021516.

The previous prime is 111742402021489. The next prime is 111742402021529. The reversal of 111742402021517 is 715120204247111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83126599829641 + 28615802191876 = 9117379^2 + 5349374^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111742402021517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111742402021717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55871201010758 + 55871201010759.

It is an arithmetic number, because the mean of its divisors is an integer number (55871201010759).

Almost surely, 2^{111742402021517} is an apocalyptic number.

It is an amenable number.

111742402021517 is a deficient number, since it is larger than the sum of its proper divisors (1).

111742402021517 is an equidigital number, since it uses as much as digits as its factorization.

111742402021517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31360, while the sum is 38.

Adding to 111742402021517 its reverse (715120204247111), we get a palindrome (826862606268628).

The spelling of 111742402021517 in words is "one hundred eleven trillion, seven hundred forty-two billion, four hundred two million, twenty-one thousand, five hundred seventeen".