212101231121 has 8 divisors (see below), whose sum is σ = 229737040680. Its totient is φ = 194654040192.

The previous prime is 212101231099. The next prime is 212101231171. The reversal of 212101231121 is 121132101212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15085980625 + 197015250496 = 122825^2 + 443864^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212101231121 - 2⁶ = 212101231057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212101231121.

It is not an unprimeable number, because it can be changed into a prime (212101231171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47152316 + ... + 47156813.

It is an arithmetic number, because the mean of its divisors is an integer number (28717130085).

Almost surely, 2^212101231121 is an apocalyptic number.

It is an amenable number.

212101231121 is a deficient number, since it is larger than the sum of its proper divisors (17635809559).

212101231121 is a wasteful number, since it uses less digits than its factorization.

212101231121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94309315.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 212101231121 its reverse (121132101212), we get a palindrome (333233332333).

The spelling of 212101231121 in words is "two hundred twelve billion, one hundred one million, two hundred thirty-one thousand, one hundred twenty-one".