1213331023121 has 16 divisors (see below), whose sum is σ = 1396508688000. Its totient is φ = 1032619907328.

The previous prime is 1213331023111. The next prime is 1213331023129. The reversal of 1213331023121 is 1213201333121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213331023121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1213331023129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2498246 + ... + 2944128.

It is an arithmetic number, because the mean of its divisors is an integer number (87281793000).

Almost surely, 2^{1213331023121} is an apocalyptic number.

It is an amenable number.

1213331023121 is a deficient number, since it is larger than the sum of its proper divisors (183177664879).

1213331023121 is a wasteful number, since it uses less digits than its factorization.

1213331023121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448648.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1213331023121 its reverse (1213201333121), we get a palindrome (2426532356242).

The spelling of 1213331023121 in words is "one trillion, two hundred thirteen billion, three hundred thirty-one million, twenty-three thousand, one hundred twenty-one".