211100210211221 has 32 divisors (see below), whose sum is σ = 213807484490880. Its totient is φ = 208416092774400.

The previous prime is 211100210211217. The next prime is 211100210211229. The reversal of 211100210211221 is 122112012001112.

It is a cyclic number.

It is not a de Polignac number, because 211100210211221 - 2² = 211100210211217 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 211100210211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211100210211229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23657981666 + ... + 23657990588.

It is an arithmetic number, because the mean of its divisors is an integer number (6681483890340).

Almost surely, 2^{211100210211221} is an apocalyptic number.

It is an amenable number.

211100210211221 is a deficient number, since it is larger than the sum of its proper divisors (2707274279659).

211100210211221 is a wasteful number, since it uses less digits than its factorization.

211100210211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10917.

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

Adding to 211100210211221 its reverse (122112012001112), we get a palindrome (333212222212333).

The spelling of 211100210211221 in words is "two hundred eleven trillion, one hundred billion, two hundred ten million, two hundred eleven thousand, two hundred twenty-one".