212102200012121 has 4 divisors (see below), whose sum is σ = 224578800012852. Its totient is φ = 199625600011392.

The previous prime is 212102200012091. The next prime is 212102200012127. The reversal of 212102200012121 is 121210002201212.

212102200012121 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 182138345106496 + 29963854905625 = 13495864^2 + 5473925^2 .

It is a cyclic number.

It is not a de Polignac number, because 212102200012121 - 2²² = 212102195817817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 12476600000713 = 212102200012121 / (2 + 1 + 2 + 1 + 0 + 2 + 2 + 0 + 0 + 0 + 1 + 2 + 1 + 2 + 1).

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 212102200012121.

It is not an unprimeable number, because it can be changed into a prime (212102200012127) 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, 6238300000340 + ... + 6238300000373.

It is an arithmetic number, because the mean of its divisors is an integer number (56144700003213).

Almost surely, 2^{212102200012121} is an apocalyptic number.

It is an amenable number.

212102200012121 is a deficient number, since it is larger than the sum of its proper divisors (12476600000731).

212102200012121 is a wasteful number, since it uses less digits than its factorization.

212102200012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12476600000730.

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

Adding to 212102200012121 its reverse (121210002201212), we get a palindrome (333312202213333).

The spelling of 212102200012121 in words is "two hundred twelve trillion, one hundred two billion, two hundred million, twelve thousand, one hundred twenty-one".