31211123111320 has 16 divisors (see below), whose sum is σ = 70225027000560. Its totient is φ = 12484449244512.

The previous prime is 31211123111299. The next prime is 31211123111323. The reversal of 31211123111320 is 2311132111213.

It is a super-2 number, since 2×31211123111320² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31211123111291 and 31211123111300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31211123111323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 390139038852 + ... + 390139038931.

It is an arithmetic number, because the mean of its divisors is an integer number (4389064187535).

Almost surely, 2^{31211123111320} is an apocalyptic number.

It is an amenable number.

31211123111320 is an abundant number, since it is smaller than the sum of its proper divisors (39013903889240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31211123111320 is a wasteful number, since it uses less digits than its factorization.

31211123111320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780278077794 (or 780278077790 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 31211123111320 its reverse (2311132111213), we get a palindrome (33522255222533).

The spelling of 31211123111320 in words is "thirty-one trillion, two hundred eleven billion, one hundred twenty-three million, one hundred eleven thousand, three hundred twenty".