12201100121 has 4 divisors (see below), whose sum is σ = 13944114432. Its totient is φ = 10458085812.

The previous prime is 12201100091. The next prime is 12201100129. The reversal of 12201100121 is 12100110221.

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: 12100110221 = 18311 ⋅660811.

It is a cyclic number.

It is not a de Polignac number, because 12201100121 - 2¹⁴ = 12201083737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12201100129) 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, 871507145 + ... + 871507158.

It is an arithmetic number, because the mean of its divisors is an integer number (3486028608).

Almost surely, 2^12201100121 is an apocalyptic number.

It is an amenable number.

12201100121 is a deficient number, since it is larger than the sum of its proper divisors (1743014311).

12201100121 is an equidigital number, since it uses as much as digits as its factorization.

12201100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1743014310.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 12201100121 its reverse (12100110221), we get a palindrome (24301210342).

The spelling of 12201100121 in words is "twelve billion, two hundred one million, one hundred thousand, one hundred twenty-one".