11221221210111 has 48 divisors (see below), whose sum is σ = 17847596052000. Its totient is φ = 6737044389120.

The previous prime is 11221221210109. The next prime is 11221221210119. The reversal of 11221221210111 is 11101212212211.

It is a happy number.

11221221210111 is a `hidden beast` number, since 1 + 1 + 221 + 221 + 210 + 1 + 11 = 666.

It is not a de Polignac number, because 11221221210111 - 2¹ = 11221221210109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221221210119) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 57191485 + ... + 57387353.

It is an arithmetic number, because the mean of its divisors is an integer number (371824917750).

Almost surely, 2^{11221221210111} is an apocalyptic number.

11221221210111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11221221210111 is a deficient number, since it is larger than the sum of its proper divisors (6626374841889).

11221221210111 is a wasteful number, since it uses less digits than its factorization.

11221221210111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201304 (or 201301 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 11221221210111 its reverse (11101212212211), we get a palindrome (22322433422322).

The spelling of 11221221210111 in words is "eleven trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred ten thousand, one hundred eleven".