12202121 has 4 divisors (see below), whose sum is σ = 12732672. Its totient is φ = 11671572.

The previous prime is 12202117. The next prime is 12202129. The reversal of 12202121 is 12120221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12120221 = 3259 ⋅3719.

It is a cyclic number.

It is not a de Polignac number, because 12202121 - 2² = 12202117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12202129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265241 + ... + 265286.

It is an arithmetic number, because the mean of its divisors is an integer number (3183168).

Almost surely, 2^12202121 is an apocalyptic number.

It is an amenable number.

12202121 is a deficient number, since it is larger than the sum of its proper divisors (530551).

12202121 is an equidigital number, since it uses as much as digits as its factorization.

12202121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530550.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 12202121 is about 3493.1534463862. The cubic root of 12202121 is about 230.2210917512.

Adding to 12202121 its reverse (12120221), we get a palindrome (24322342).

The spelling of 12202121 in words is "twelve million, two hundred two thousand, one hundred twenty-one".