12120311211231 has 16 divisors (see below), whose sum is σ = 16220561571200. Its totient is φ = 8050173711840.

The previous prime is 12120311211223. The next prime is 12120311211301. The reversal of 12120311211231 is 13211211302121.

It is not a de Polignac number, because 12120311211231 - 2³ = 12120311211223 is a prime.

It is a super-2 number, since 2×12120311211231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12120311211198 and 12120311211207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120311215231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3716845 + ... + 6168918.

It is an arithmetic number, because the mean of its divisors is an integer number (1013785098200).

Almost surely, 2^{12120311211231} is an apocalyptic number.

12120311211231 is a deficient number, since it is larger than the sum of its proper divisors (4100250359969).

12120311211231 is a wasteful number, since it uses less digits than its factorization.

12120311211231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9887286.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 12120311211231 its reverse (13211211302121), we get a palindrome (25331522513352).

The spelling of 12120311211231 in words is "twelve trillion, one hundred twenty billion, three hundred eleven million, two hundred eleven thousand, two hundred thirty-one".