221101212111 has 32 divisors (see below), whose sum is σ = 318715907328. Its totient is φ = 135533080320.

The previous prime is 221101212103. The next prime is 221101212113. The reversal of 221101212111 is 111212101122.

It is a happy number.

It is not a de Polignac number, because 221101212111 - 2³ = 221101212103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221101212113) 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, 10680691 + ... + 10701371.

It is an arithmetic number, because the mean of its divisors is an integer number (9959872104).

Almost surely, 2^221101212111 is an apocalyptic number.

221101212111 is a deficient number, since it is larger than the sum of its proper divisors (97614695217).

221101212111 is a wasteful number, since it uses less digits than its factorization.

221101212111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21751.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221101212111 its reverse (111212101122), we get a palindrome (332313313233).

The spelling of 221101212111 in words is "two hundred twenty-one billion, one hundred one million, two hundred twelve thousand, one hundred eleven".