212102020210121 has 4 divisors (see below), whose sum is σ = 212102057141700. Its totient is φ = 212101983278544.

The previous prime is 212102020210013. The next prime is 212102020210183. The reversal of 212102020210121 is 121012020201212.

212102020210121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4703541625225 + 207398478584896 = 2168765^2 + 14401336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212102020210121 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 212102020210121.

It is not an unprimeable number, because it can be changed into a prime (212102020213121) 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, 7796126 + ... + 22022343.

It is an arithmetic number, because the mean of its divisors is an integer number (53025514285425).

Almost surely, 2^{212102020210121} is an apocalyptic number.

It is an amenable number.

212102020210121 is a deficient number, since it is larger than the sum of its proper divisors (36931579).

212102020210121 is an equidigital number, since it uses as much as digits as its factorization.

212102020210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36931578.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 212102020210121 its reverse (121012020201212), we get a palindrome (333114040411333).

The spelling of 212102020210121 in words is "two hundred twelve trillion, one hundred two billion, twenty million, two hundred ten thousand, one hundred twenty-one".