111221122211001 has 48 divisors (see below), whose sum is σ = 180054012535488. Its totient is φ = 65563148649600.

The previous prime is 111221122210993. The next prime is 111221122211033. The reversal of 111221122211001 is 100112221122111.

It is a happy number.

111221122211001 is a `hidden beast` number, since 111 + 221 + 1 + 222 + 110 + 0 + 1 = 666.

It is not a de Polignac number, because 111221122211001 - 2³ = 111221122210993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111220122211001) 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, 5987215 + ... + 16071371.

It is an arithmetic number, because the mean of its divisors is an integer number (3751125261156).

Almost surely, 2^{111221122211001} is an apocalyptic number.

111221122211001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111221122211001 is a deficient number, since it is larger than the sum of its proper divisors (68832890324487).

111221122211001 is a wasteful number, since it uses less digits than its factorization.

111221122211001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10087222 (or 10087219 counting only the distinct ones).

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

Adding to 111221122211001 its reverse (100112221122111), we get a palindrome (211333343333112).

The spelling of 111221122211001 in words is "one hundred eleven trillion, two hundred twenty-one billion, one hundred twenty-two million, two hundred eleven thousand, one".