12201210121 has 4 divisors (see below), whose sum is σ = 12201458500. Its totient is φ = 12200961744.

The previous prime is 12201210103. The next prime is 12201210127. The reversal of 12201210121 is 12101210221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6016174096 + 6185036025 = 77564^2 + 78645^2 .

It is a cyclic number.

It is not a de Polignac number, because 12201210121 - 2²¹ = 12199112969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12201210127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23046 + ... + 157903.

It is an arithmetic number, because the mean of its divisors is an integer number (3050364625).

Almost surely, 2^12201210121 is an apocalyptic number.

It is an amenable number.

12201210121 is a deficient number, since it is larger than the sum of its proper divisors (248379).

12201210121 is an equidigital number, since it uses as much as digits as its factorization.

12201210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248378.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12201210121 its reverse (12101210221), we get a palindrome (24302420342).

The spelling of 12201210121 in words is "twelve billion, two hundred one million, two hundred ten thousand, one hundred twenty-one".