221122111221 has 32 divisors (see below), whose sum is σ = 378390787200. Its totient is φ = 126130256640.

The previous prime is 221122111219. The next prime is 221122111229. The reversal of 221122111221 is 122111221122.

221122111221 is a `hidden beast` number, since 2 + 211 + 221 + 11 + 221 = 666.

It is not a de Polignac number, because 221122111221 - 2¹ = 221122111219 is a prime.

It is a super-2 number, since 2×221122111221² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221122111194 and 221122111203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221122111229) 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, 21892566 + ... + 21902663.

It is an arithmetic number, because the mean of its divisors is an integer number (11824712100).

Almost surely, 2^221122111221 is an apocalyptic number.

It is an amenable number.

221122111221 is a deficient number, since it is larger than the sum of its proper divisors (157268675979).

221122111221 is a wasteful number, since it uses less digits than its factorization.

221122111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43795266 (or 43795260 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 221122111221 its reverse (122111221122), we get a palindrome (343233332343).

The spelling of 221122111221 in words is "two hundred twenty-one billion, one hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".