212111109 has 16 divisors (see below), whose sum is σ = 359130240. Its totient is φ = 121206240.

The previous prime is 212111101. The next prime is 212111111. The reversal of 212111109 is 901111212.

It is a happy number.

It is not a de Polignac number, because 212111109 - 2³ = 212111101 is a prime.

It is a super-2 number, since 2×212111109² = 89982245122419762, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212111091 and 212111100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212111101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 560952 + ... + 561329.

It is an arithmetic number, because the mean of its divisors is an integer number (22445640).

Almost surely, 2^212111109 is an apocalyptic number.

It is an amenable number.

212111109 is a deficient number, since it is larger than the sum of its proper divisors (147019131).

212111109 is a wasteful number, since it uses less digits than its factorization.

212111109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122297 (or 1122291 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The square root of 212111109 is about 14564.0347774921. The cubic root of 212111109 is about 596.3773463212.

The spelling of 212111109 in words is "two hundred twelve million, one hundred eleven thousand, one hundred nine".