12213203232121 has 4 divisors (see below), whose sum is σ = 12275199187812. Its totient is φ = 12151207276432.

The previous prime is 12213203232059. The next prime is 12213203232127. The reversal of 12213203232121 is 12123230231221.

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 10723424312896 + 1489778919225 = 3274664^2 + 1220565^2 .

It is a cyclic number.

It is not a de Polignac number, because 12213203232121 - 2¹¹ = 12213203230073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12213203232127) 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, 30997977550 + ... + 30997977943.

It is an arithmetic number, because the mean of its divisors is an integer number (3068799796953).

Almost surely, 2^{12213203232121} is an apocalyptic number.

It is an amenable number.

12213203232121 is a deficient number, since it is larger than the sum of its proper divisors (61995955691).

12213203232121 is an equidigital number, since it uses as much as digits as its factorization.

12213203232121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61995955690.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 12213203232121 its reverse (12123230231221), we get a palindrome (24336433463342).

The spelling of 12213203232121 in words is "twelve trillion, two hundred thirteen billion, two hundred three million, two hundred thirty-two thousand, one hundred twenty-one".