111221051573 has 2 divisors, whose sum is σ = 111221051574. Its totient is φ = 111221051572.

The previous prime is 111221051533. The next prime is 111221051587. The reversal of 111221051573 is 375150122111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91931452804 + 19289598769 = 303202^2 + 138887^2 .

It is a cyclic number.

It is not a de Polignac number, because 111221051573 - 2²⁰ = 111220002997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111221051533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610525786 + 55610525787.

It is an arithmetic number, because the mean of its divisors is an integer number (55610525787).

Almost surely, 2^111221051573 is an apocalyptic number.

It is an amenable number.

111221051573 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221051573 is an equidigital number, since it uses as much as digits as its factorization.

111221051573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2100, while the sum is 29.

Adding to 111221051573 its reverse (375150122111), we get a palindrome (486371173684).

The spelling of 111221051573 in words is "one hundred eleven billion, two hundred twenty-one million, fifty-one thousand, five hundred seventy-three".