212101023121 has 8 divisors (see below), whose sum is σ = 228676950824. Its totient is φ = 195562304640.

The previous prime is 212101023061. The next prime is 212101023137. The reversal of 212101023121 is 121320101212.

It can be written as a sum of positive squares in 4 ways, for example, as 67761816721 + 144339206400 = 260311^2 + 379920^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212101023121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212101023095 and 212101023104.

It is not an unprimeable number, because it can be changed into a prime (212101023181) 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, 9290460 + ... + 9313261.

It is an arithmetic number, because the mean of its divisors is an integer number (28584618853).

Almost surely, 2^212101023121 is an apocalyptic number.

It is an amenable number.

212101023121 is a deficient number, since it is larger than the sum of its proper divisors (16575927703).

212101023121 is a wasteful number, since it uses less digits than its factorization.

212101023121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18604611.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 212101023121 its reverse (121320101212), we get a palindrome (333421124333).

The spelling of 212101023121 in words is "two hundred twelve billion, one hundred one million, twenty-three thousand, one hundred twenty-one".