211121212220101 has 4 divisors (see below), whose sum is σ = 211125783275712. Its totient is φ = 211116641164492.

The previous prime is 211121212220077. The next prime is 211121212220111. The reversal of 211121212220101 is 101022212121112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211121212220101 - 2¹¹ = 211121212218053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121212220111) 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 3 ways as a sum of consecutive naturals, for example, 2285458525 + ... + 2285550898.

It is an arithmetic number, because the mean of its divisors is an integer number (52781445818928).

Almost surely, 2^{211121212220101} is an apocalyptic number.

It is an amenable number.

211121212220101 is a deficient number, since it is larger than the sum of its proper divisors (4571055611).

211121212220101 is an equidigital number, since it uses as much as digits as its factorization.

211121212220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4571055610.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 211121212220101 its reverse (101022212121112), we get a palindrome (312143424341213).

The spelling of 211121212220101 in words is "two hundred eleven trillion, one hundred twenty-one billion, two hundred twelve million, two hundred twenty thousand, one hundred one".