11221111111221 has 40 divisors (see below), whose sum is σ = 18596191759200. Its totient is φ = 6685407718560.

The previous prime is 11221111111181. The next prime is 11221111111229. The reversal of 11221111111221 is 12211111112211.

11221111111221 is a `hidden beast` number, since 1 + 1 + 221 + 111 + 111 + 221 = 666.

It is not a de Polignac number, because 11221111111221 - 2⁹ = 11221111110709 is a prime.

It is a super-2 number, since 2×11221111111221² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11221111111194 and 11221111111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11221111111229) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 106674886 + ... + 106780023.

It is an arithmetic number, because the mean of its divisors is an integer number (464904793980).

Almost surely, 2^{11221111111221} is an apocalyptic number.

11221111111221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11221111111221 is a deficient number, since it is larger than the sum of its proper divisors (7375080647979).

11221111111221 is a wasteful number, since it uses less digits than its factorization.

11221111111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213454991 (or 213454982 counting only the distinct ones).

The product of its digits is 16, while the sum is 18.

Adding to 11221111111221 its reverse (12211111112211), we get a palindrome (23432222223432).

The spelling of 11221111111221 in words is "eleven trillion, two hundred twenty-one billion, one hundred eleven million, one hundred eleven thousand, two hundred twenty-one".