212121021100121 has 8 divisors (see below), whose sum is σ = 242600589328704. Its totient is φ = 181685594175120.

The previous prime is 212121021100117. The next prime is 212121021100127. The reversal of 212121021100121 is 121001120121212.

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

It is not a de Polignac number, because 212121021100121 - 2² = 212121021100117 is a prime.

It is a super-3 number, since 3×212121021100121³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 212121021100121.

It is not an unprimeable number, because it can be changed into a prime (212121021100127) 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, 11035315595 + ... + 11035334816.

It is an arithmetic number, because the mean of its divisors is an integer number (30325073666088).

Almost surely, 2^{212121021100121} is an apocalyptic number.

It is an amenable number.

212121021100121 is a deficient number, since it is larger than the sum of its proper divisors (30479568228583).

212121021100121 is a wasteful number, since it uses less digits than its factorization.

212121021100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22070651791.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 212121021100121 its reverse (121001120121212), we get a palindrome (333122141221333).

The spelling of 212121021100121 in words is "two hundred twelve trillion, one hundred twenty-one billion, twenty-one million, one hundred thousand, one hundred twenty-one".