12213121032121 has 4 divisors (see below), whose sum is σ = 12213166543732. Its totient is φ = 12213075520512.

The previous prime is 12213121032043. The next prime is 12213121032271. The reversal of 12213121032121 is 12123012131221.

It is a happy number.

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 7446409473721 + 4766711558400 = 2728811^2 + 2183280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12213121032121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12213121032092 and 12213121032101.

It is not an unprimeable number, because it can be changed into a prime (12213121072121) 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, 22350876 + ... + 22890781.

It is an arithmetic number, because the mean of its divisors is an integer number (3053291635933).

Almost surely, 2^{12213121032121} is an apocalyptic number.

It is an amenable number.

12213121032121 is a deficient number, since it is larger than the sum of its proper divisors (45511611).

12213121032121 is an equidigital number, since it uses as much as digits as its factorization.

12213121032121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45511610.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 12213121032121 its reverse (12123012131221), we get a palindrome (24336133163342).

The spelling of 12213121032121 in words is "twelve trillion, two hundred thirteen billion, one hundred twenty-one million, thirty-two thousand, one hundred twenty-one".