212031111321 has 40 divisors (see below), whose sum is σ = 335502578664. Its totient is φ = 132986327040.

The previous prime is 212031111263. The next prime is 212031111323. The reversal of 212031111321 is 123111130212.

212031111321 is a `hidden beast` number, since 2 + 1 + 20 + 311 + 11 + 321 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 80903838096 + 131127273225 = 284436^2 + 362115^2 .

It is not a de Polignac number, because 212031111321 - 2¹⁰ = 212031110297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212031111294 and 212031111303.

It is not an unprimeable number, because it can be changed into a prime (212031111323) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3596401 + ... + 3654881.

Almost surely, 2^212031111321 is an apocalyptic number.

It is an amenable number.

212031111321 is a deficient number, since it is larger than the sum of its proper divisors (123471467343).

212031111321 is a wasteful number, since it uses less digits than its factorization.

212031111321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61143 (or 61134 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 212031111321 its reverse (123111130212), we get a palindrome (335142241533).

The spelling of 212031111321 in words is "two hundred twelve billion, thirty-one million, one hundred eleven thousand, three hundred twenty-one".