1213121013223 has 8 divisors (see below), whose sum is σ = 1389813808160. Its totient is φ = 1037275666560.

The previous prime is 1213121013191. The next prime is 1213121013227. The reversal of 1213121013223 is 3223101213121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1213121013223 - 2⁵ = 1213121013191 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213121013194 and 1213121013203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213121013227) 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 7 ways as a sum of consecutive naturals, for example, 211858998 + ... + 211864723.

It is an arithmetic number, because the mean of its divisors is an integer number (173726726020).

Almost surely, 2^{1213121013223} is an apocalyptic number.

1213121013223 is a deficient number, since it is larger than the sum of its proper divisors (176692794937).

1213121013223 is an equidigital number, since it uses as much as digits as its factorization.

1213121013223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423724137.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1213121013223 its reverse (3223101213121), we get a palindrome (4436222226344).

The spelling of 1213121013223 in words is "one trillion, two hundred thirteen billion, one hundred twenty-one million, thirteen thousand, two hundred twenty-three".