100212111 has 12 divisors (see below), whose sum is σ = 145165488. Its totient is φ = 66616704.

The previous prime is 100212103. The next prime is 100212113. The reversal of 100212111 is 111212001.

It is a happy number.

It is not a de Polignac number, because 100212111 - 2³ = 100212103 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 100212093 and 100212102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100212113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12595 + ... + 18948.

It is an arithmetic number, because the mean of its divisors is an integer number (12097124).

Almost surely, 2^100212111 is an apocalyptic number.

100212111 is a deficient number, since it is larger than the sum of its proper divisors (44953377).

100212111 is a wasteful number, since it uses less digits than its factorization.

100212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31902 (or 31899 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 100212111 is about 10010.5999320720. The cubic root of 100212111 is about 464.4868289506.

Adding to 100212111 its reverse (111212001), we get a palindrome (211424112).

The spelling of 100212111 in words is "one hundred million, two hundred twelve thousand, one hundred eleven".