211110101221 has 16 divisors (see below), whose sum is σ = 226996473600. Its totient is φ = 195720677568.

The previous prime is 211110101161. The next prime is 211110101249. The reversal of 211110101221 is 122101011112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 211110101221 - 2⁹ = 211110100709 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 (211110101261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122260 + ... + 661186.

It is an arithmetic number, because the mean of its divisors is an integer number (14187279600).

Almost surely, 2^211110101221 is an apocalyptic number.

It is an amenable number.

211110101221 is a deficient number, since it is larger than the sum of its proper divisors (15886372379).

211110101221 is a wasteful number, since it uses less digits than its factorization.

211110101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539388.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 211110101221 its reverse (122101011112), we get a palindrome (333211112333).

The spelling of 211110101221 in words is "two hundred eleven billion, one hundred ten million, one hundred one thousand, two hundred twenty-one".