111175065561221 has 2 divisors, whose sum is σ = 111175065561222. Its totient is φ = 111175065561220.

The previous prime is 111175065561173. The next prime is 111175065561253. The reversal of 111175065561221 is 122165560571111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76755559050625 + 34419506510596 = 8761025^2 + 5866814^2 .

It is an emirp because it is prime and its reverse (122165560571111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111175065561221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111175065567221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55587532780610 + 55587532780611.

It is an arithmetic number, because the mean of its divisors is an integer number (55587532780611).

Almost surely, 2^{111175065561221} is an apocalyptic number.

It is an amenable number.

111175065561221 is a deficient number, since it is larger than the sum of its proper divisors (1).

111175065561221 is an equidigital number, since it uses as much as digits as its factorization.

111175065561221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126000, while the sum is 44.

The spelling of 111175065561221 in words is "one hundred eleven trillion, one hundred seventy-five billion, sixty-five million, five hundred sixty-one thousand, two hundred twenty-one".