12209021 has 24 divisors (see below), whose sum is σ = 14478912. Its totient is φ = 10260800.

The previous prime is 12209011. The next prime is 12209023. The reversal of 12209021 is 12090221.

It is not a de Polignac number, because 12209021 - 2⁶ = 12208957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12209023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 114050 + ... + 114156.

It is an arithmetic number, because the mean of its divisors is an integer number (603288).

Almost surely, 2^12209021 is an apocalyptic number.

12209021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12209021 is a deficient number, since it is larger than the sum of its proper divisors (2269891).

12209021 is a wasteful number, since it uses less digits than its factorization.

12209021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193 (or 182 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 12209021 is about 3494.1409530813. The cubic root of 12209021 is about 230.2644783669.

Adding to 12209021 its reverse (12090221), we get a palindrome (24299242).

It can be divided in two parts, 1 and 2209021, that added together give a palindrome (2209022).

The spelling of 12209021 in words is "twelve million, two hundred nine thousand, twenty-one".