212121020200121 has 8 divisors (see below), whose sum is σ = 223893691198080. Its totient is φ = 200409189879888.

The previous prime is 212121020200097. The next prime is 212121020200123. The reversal of 212121020200121 is 121002020121212.

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-212121020200121 is a prime.

It is a super-3 number, since 3×212121020200121³ (a number of 44 digits) contains 333 as substring.

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 212121020200121.

It is not an unprimeable number, because it can be changed into a prime (212121020200123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15210162266 + ... + 15210176211.

It is an arithmetic number, because the mean of its divisors is an integer number (27986711399760).

Almost surely, 2^{212121020200121} is an apocalyptic number.

It is an amenable number.

212121020200121 is a deficient number, since it is larger than the sum of its proper divisors (11772670997959).

212121020200121 is a wasteful number, since it uses less digits than its factorization.

212121020200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30420338863.

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

Adding to 212121020200121 its reverse (121002020121212), we get a palindrome (333123040321333).

The spelling of 212121020200121 in words is "two hundred twelve trillion, one hundred twenty-one billion, twenty million, two hundred thousand, one hundred twenty-one".