221112100001 has 4 divisors (see below), whose sum is σ = 238120723092. Its totient is φ = 204103476912.

The previous prime is 221112099991. The next prime is 221112100007. The reversal of 221112100001 is 100001211122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 145123664401 + 75988435600 = 380951^2 + 275660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221112100001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221112100007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8504311526 + ... + 8504311551.

It is an arithmetic number, because the mean of its divisors is an integer number (59530180773).

Almost surely, 2^221112100001 is an apocalyptic number.

It is an amenable number.

221112100001 is a deficient number, since it is larger than the sum of its proper divisors (17008623091).

221112100001 is a wasteful number, since it uses less digits than its factorization.

221112100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17008623090.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 221112100001 its reverse (100001211122), we get a palindrome (321113311123).

The spelling of 221112100001 in words is "two hundred twenty-one billion, one hundred twelve million, one hundred thousand, one".