211200021111221 has 8 divisors (see below), whose sum is σ = 214676545088544. Its totient is φ = 207733034923920.

The previous prime is 211200021111133. The next prime is 211200021111241. The reversal of 211200021111221 is 122111120002112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211200021111221 is a prime.

It is a super-2 number, since 2×211200021111221² (a number of 29 digits) contains 22 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 211200021111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211200021111241) 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, 2384402855 + ... + 2384491428.

It is an arithmetic number, because the mean of its divisors is an integer number (26834568136068).

Almost surely, 2^{211200021111221} is an apocalyptic number.

It is an amenable number.

211200021111221 is a deficient number, since it is larger than the sum of its proper divisors (3476523977323).

211200021111221 is an equidigital number, since it uses as much as digits as its factorization.

211200021111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4768895011.

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

Adding to 211200021111221 its reverse (122111120002112), we get a palindrome (333311141113333).

The spelling of 211200021111221 in words is "two hundred eleven trillion, two hundred billion, twenty-one million, one hundred eleven thousand, two hundred twenty-one".