111355443121201 has 4 divisors (see below), whose sum is σ = 111355871524900. Its totient is φ = 111355014717504.

The previous prime is 111355443121199. The next prime is 111355443121249. The reversal of 111355443121201 is 102121344553111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71697692567601 + 39657750553600 = 8467449^2 + 6297440^2 .

It is a cyclic number.

It is not a de Polignac number, because 111355443121201 - 2¹ = 111355443121199 is a prime.

It is a super-2 number, since 2×111355443121201² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111355443181201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213811716 + ... + 214331893.

It is an arithmetic number, because the mean of its divisors is an integer number (27838967881225).

Almost surely, 2^{111355443121201} is an apocalyptic number.

It is an amenable number.

111355443121201 is a deficient number, since it is larger than the sum of its proper divisors (428403699).

111355443121201 is an equidigital number, since it uses as much as digits as its factorization.

111355443121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428403698.

The product of its (nonzero) digits is 14400, while the sum is 34.

Adding to 111355443121201 its reverse (102121344553111), we get a palindrome (213476787674312).

The spelling of 111355443121201 in words is "one hundred eleven trillion, three hundred fifty-five billion, four hundred forty-three million, one hundred twenty-one thousand, two hundred one".