100011212111 has 4 divisors (see below), whose sum is σ = 100051171152. Its totient is φ = 99971253072.

The previous prime is 100011212083. The next prime is 100011212141. The reversal of 100011212111 is 111212110001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 111212110001 = 1129 ⋅98504969.

It is a cyclic number.

It is not a de Polignac number, because 100011212111 - 2²⁶ = 99944103247 is a prime.

It is a super-2 number, since 2×100011212111² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100011212092 and 100011212101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100011212141) 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, 19975766 + ... + 19980771.

It is an arithmetic number, because the mean of its divisors is an integer number (25012792788).

Almost surely, 2^100011212111 is an apocalyptic number.

100011212111 is a deficient number, since it is larger than the sum of its proper divisors (39959041).

100011212111 is an equidigital number, since it uses as much as digits as its factorization.

100011212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39959040.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 100011212111 its reverse (111212110001), we get a palindrome (211223322112).

The spelling of 100011212111 in words is "one hundred billion, eleven million, two hundred twelve thousand, one hundred eleven".