221112001001 has 4 divisors (see below), whose sum is σ = 221333779332. Its totient is φ = 220890222672.

The previous prime is 221112000943. The next prime is 221112001007. The reversal of 221112001001 is 100100211122.

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 134117088400 + 86994912601 = 366220^2 + 294949^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221112001001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221112001007) 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, 110887670 + ... + 110889663.

It is an arithmetic number, because the mean of its divisors is an integer number (55333444833).

Almost surely, 2^221112001001 is an apocalyptic number.

It is an amenable number.

221112001001 is a deficient number, since it is larger than the sum of its proper divisors (221778331).

221112001001 is an equidigital number, since it uses as much as digits as its factorization.

221112001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221778330.

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

Adding to 221112001001 its reverse (100100211122), we get a palindrome (321212212123).

The spelling of 221112001001 in words is "two hundred twenty-one billion, one hundred twelve million, one thousand, one".