211121220101 has 4 divisors (see below), whose sum is σ = 230314058304. Its totient is φ = 191928381900.

The previous prime is 211121220007. The next prime is 211121220221. The reversal of 211121220101 is 101022121112.

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 a de Polignac number, because none of the positive numbers 2^k-211121220101 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211121225101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9596419085 + ... + 9596419106.

It is an arithmetic number, because the mean of its divisors is an integer number (57578514576).

Almost surely, 2^211121220101 is an apocalyptic number.

It is an amenable number.

211121220101 is a deficient number, since it is larger than the sum of its proper divisors (19192838203).

211121220101 is a wasteful number, since it uses less digits than its factorization.

211121220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19192838202.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 211121220101 its reverse (101022121112), we get a palindrome (312143341213).

It can be divided in two parts, 2111 and 21220101, that added together give a palindrome (21222212).

The spelling of 211121220101 in words is "two hundred eleven billion, one hundred twenty-one million, two hundred twenty thousand, one hundred one".