1213223122121 has 4 divisors (see below), whose sum is σ = 1213316755200. Its totient is φ = 1213129489044.

The previous prime is 1213223122103. The next prime is 1213223122151. The reversal of 1213223122121 is 1212213223121.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213223122121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213223122151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46797101 + ... + 46823018.

It is an arithmetic number, because the mean of its divisors is an integer number (303329188800).

Almost surely, 2^{1213223122121} is an apocalyptic number.

It is an amenable number.

1213223122121 is a deficient number, since it is larger than the sum of its proper divisors (93633079).

1213223122121 is an equidigital number, since it uses as much as digits as its factorization.

1213223122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93633078.

The product of its digits is 576, while the sum is 23.

Adding to 1213223122121 its reverse (1212213223121), we get a palindrome (2425436345242).

The spelling of 1213223122121 in words is "one trillion, two hundred thirteen billion, two hundred twenty-three million, one hundred twenty-two thousand, one hundred twenty-one".