212031302121 has 12 divisors (see below), whose sum is σ = 314544935172. Its totient is φ = 137533817376.

The previous prime is 212031302117. The next prime is 212031302173. The reversal of 212031302121 is 121203130212.

212031302121 is a `hidden beast` number, since 212 + 0 + 31 + 302 + 121 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 188977131225 + 23054170896 = 434715^2 + 151836^2 .

It is not a de Polignac number, because 212031302121 - 2² = 212031302117 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212031302094 and 212031302103.

It is not an unprimeable number, because it can be changed into a prime (212031302101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 318364986 + ... + 318365651.

It is an arithmetic number, because the mean of its divisors is an integer number (26212077931).

Almost surely, 2^212031302121 is an apocalyptic number.

It is an amenable number.

212031302121 is a deficient number, since it is larger than the sum of its proper divisors (102513633051).

212031302121 is a wasteful number, since it uses less digits than its factorization.

212031302121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636730680 (or 636730677 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 212031302121 its reverse (121203130212), we get a palindrome (333234432333).

The spelling of 212031302121 in words is "two hundred twelve billion, thirty-one million, three hundred two thousand, one hundred twenty-one".