211021112212121 has 8 divisors (see below), whose sum is σ = 223434289441440. Its totient is φ = 198607953941568.

The previous prime is 211021112212117. The next prime is 211021112212133. The reversal of 211021112212121 is 121212211120112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 211021112212121 - 2² = 211021112212117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211021112212093 and 211021112212102.

It is not an unprimeable number, because it can be changed into a prime (211021112212151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22722350 + ... + 30632456.

It is an arithmetic number, because the mean of its divisors is an integer number (27929286180180).

Almost surely, 2^{211021112212121} is an apocalyptic number.

It is an amenable number.

211021112212121 is a deficient number, since it is larger than the sum of its proper divisors (12413177229319).

211021112212121 is a wasteful number, since it uses less digits than its factorization.

211021112212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9479383.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 211021112212121 its reverse (121212211120112), we get a palindrome (332233323332233).

The spelling of 211021112212121 in words is "two hundred eleven trillion, twenty-one billion, one hundred twelve million, two hundred twelve thousand, one hundred twenty-one".