111220210212111 has 128 divisors (see below), whose sum is σ = 223378440929280. Its totient is φ = 52814577225600.

The previous prime is 111220210212077. The next prime is 111220210212127. The reversal of 111220210212111 is 111212012022111.

It is a happy number.

111220210212111 is a `hidden beast` number, since 1 + 1 + 1 + 220 + 210 + 21 + 211 + 1 = 666.

It is not a de Polignac number, because 111220210212111 - 2³⁹ = 110670454398223 is a prime.

It is a super-2 number, since 2×111220210212111² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111220210212131) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 17192685 + ... + 22760246.

It is an arithmetic number, because the mean of its divisors is an integer number (1745144069760).

Almost surely, 2^{111220210212111} is an apocalyptic number.

111220210212111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111220210212111 is an abundant number, since it is smaller than the sum of its proper divisors (112158230717169).

111220210212111 is a wasteful number, since it uses less digits than its factorization.

111220210212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39953074 (or 39953068 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 111220210212111 its reverse (111212012022111), we get a palindrome (222432222234222).

The spelling of 111220210212111 in words is "one hundred eleven trillion, two hundred twenty billion, two hundred ten million, two hundred twelve thousand, one hundred eleven".