121231211323 has 16 divisors (see below), whose sum is σ = 123322210560. Its totient is φ = 119159964000.

The previous prime is 121231211219. The next prime is 121231211351. The reversal of 121231211323 is 323112132121.

It is a cyclic number.

It is not a de Polignac number, because 121231211323 - 2⁹ = 121231210811 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121231211294 and 121231211303.

It is not an unprimeable number, because it can be changed into a prime (121231211363) 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 15 ways as a sum of consecutive naturals, for example, 11402536 + ... + 11413162.

It is an arithmetic number, because the mean of its divisors is an integer number (7707638160).

Almost surely, 2^121231211323 is an apocalyptic number.

121231211323 is a deficient number, since it is larger than the sum of its proper divisors (2090999237).

121231211323 is a wasteful number, since it uses less digits than its factorization.

121231211323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11538.

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

Adding to 121231211323 its reverse (323112132121), we get a palindrome (444343343444).

The spelling of 121231211323 in words is "one hundred twenty-one billion, two hundred thirty-one million, two hundred eleven thousand, three hundred twenty-three".