12212109 has 72 divisors (see below), whose sum is σ = 23142912. Its totient is φ = 6065280.

The previous prime is 12212107. The next prime is 12212111. The reversal of 12212109 is 90121221.

It is an interprime number because it is at equal distance from previous prime (12212107) and next prime (12212111).

It is not a de Polignac number, because 12212109 - 2¹ = 12212107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12212091 and 12212100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212107) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 330039 + ... + 330075.

Almost surely, 2^12212109 is an apocalyptic number.

It is an amenable number.

12212109 is a deficient number, since it is larger than the sum of its proper divisors (10930803).

12212109 is a wasteful number, since it uses less digits than its factorization.

12212109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 12212109 is about 3494.5828077183. The cubic root of 12212109 is about 230.2838901545.

It can be divided in two parts, 12212 and 109, that added together give a palindrome (12321).

The spelling of 12212109 in words is "twelve million, two hundred twelve thousand, one hundred nine".