12212409 has 24 divisors (see below), whose sum is σ = 18960480. Its totient is φ = 6962560.

The previous prime is 12212407. The next prime is 12212413. The reversal of 12212409 is 90421221.

It is not a de Polignac number, because 12212409 - 2¹ = 12212407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12212407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5182 + ... + 7160.

It is an arithmetic number, because the mean of its divisors is an integer number (790020).

Almost surely, 2^12212409 is an apocalyptic number.

It is an amenable number.

12212409 is a deficient number, since it is larger than the sum of its proper divisors (6748071).

12212409 is a wasteful number, since it uses less digits than its factorization.

12212409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2021 (or 2010 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 12212409 is about 3494.6257310333. The cubic root of 12212409 is about 230.2857758403.

It can be divided in two parts, 12212 and 409, that added together give a palindrome (12621).

The spelling of 12212409 in words is "twelve million, two hundred twelve thousand, four hundred nine".