221012211111 has 16 divisors (see below), whose sum is σ = 302679424608. Its totient is φ = 143344080000.

The previous prime is 221012211071. The next prime is 221012211131. The reversal of 221012211111 is 111112210122.

It is a happy number.

It is not a de Polignac number, because 221012211111 - 2⁹ = 221012210599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012211131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 998461 + ... + 1199561.

It is an arithmetic number, because the mean of its divisors is an integer number (18917464038).

Almost surely, 2^221012211111 is an apocalyptic number.

221012211111 is a deficient number, since it is larger than the sum of its proper divisors (81667213497).

221012211111 is a wasteful number, since it uses less digits than its factorization.

221012211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211042.

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

Adding to 221012211111 its reverse (111112210122), we get a palindrome (332124421233).

It can be divided in two parts, 2210122 and 11111, that multiplied together give a palindrome (24556665542).

The spelling of 221012211111 in words is "two hundred twenty-one billion, twelve million, two hundred eleven thousand, one hundred eleven".