211111201220201 has 4 divisors (see below), whose sum is σ = 211130681825412. Its totient is φ = 211091720614992.

The previous prime is 211111201220173. The next prime is 211111201220233. The reversal of 211111201220201 is 102022102111112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22518631344400 + 188592569875801 = 4745380^2 + 13732901^2 .

It is a cyclic number.

It is not a de Polignac number, because 211111201220201 - 2⁶ = 211111201220137 is a prime.

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 211111201220201.

It is not an unprimeable number, because it can be changed into a prime (211111201240201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9740286350 + ... + 9740308023.

It is an arithmetic number, because the mean of its divisors is an integer number (52782670456353).

Almost surely, 2^{211111201220201} is an apocalyptic number.

It is an amenable number.

211111201220201 is a deficient number, since it is larger than the sum of its proper divisors (19480605211).

211111201220201 is a wasteful number, since it uses less digits than its factorization.

211111201220201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19480605210.

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

Adding to 211111201220201 its reverse (102022102111112), we get a palindrome (313133303331313).

The spelling of 211111201220201 in words is "two hundred eleven trillion, one hundred eleven billion, two hundred one million, two hundred twenty thousand, two hundred one".