111200022181 has 2 divisors, whose sum is σ = 111200022182. Its totient is φ = 111200022180.

The previous prime is 111200022169. The next prime is 111200022289. The reversal of 111200022181 is 181220002111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108603202500 + 2596819681 = 329550^2 + 50959^2 .

It is a cyclic number.

It is not a de Polignac number, because 111200022181 - 2²⁵ = 111166467749 is a prime.

It is a super-2 number, since 2×111200022181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111200022151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55600011090 + 55600011091.

It is an arithmetic number, because the mean of its divisors is an integer number (55600011091).

Almost surely, 2^111200022181 is an apocalyptic number.

It is an amenable number.

111200022181 is a deficient number, since it is larger than the sum of its proper divisors (1).

111200022181 is an equidigital number, since it uses as much as digits as its factorization.

111200022181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 111200022181 its reverse (181220002111), we get a palindrome (292420024292).

The spelling of 111200022181 in words is "one hundred eleven billion, two hundred million, twenty-two thousand, one hundred eighty-one".