221001112111 has 16 divisors (see below), whose sum is σ = 242600285088. Its totient is φ = 200078236800.

The previous prime is 221001112097. The next prime is 221001112133. The reversal of 221001112111 is 111211100122.

It is a happy number.

It is not a de Polignac number, because 221001112111 - 2⁷ = 221001111983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221001112091 and 221001112100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001112411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126400 + ... + 676741.

It is an arithmetic number, because the mean of its divisors is an integer number (15162517818).

Almost surely, 2^221001112111 is an apocalyptic number.

221001112111 is a deficient number, since it is larger than the sum of its proper divisors (21599172977).

221001112111 is a wasteful number, since it uses less digits than its factorization.

221001112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803562.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 221001112111 its reverse (111211100122), we get a palindrome (332212212233).

The spelling of 221001112111 in words is "two hundred twenty-one billion, one million, one hundred twelve thousand, one hundred eleven".