221001111001 has 16 divisors (see below), whose sum is σ = 255709016640. Its totient is φ = 188769633280.

The previous prime is 221001110971. The next prime is 221001111059. The reversal of 221001111001 is 100111100122.

It is a cyclic number.

It is not a de Polignac number, because 221001111001 - 2⁵ = 221001110969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221001111091) 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, 896896 + ... + 1116433.

It is an arithmetic number, because the mean of its divisors is an integer number (15981813540).

Almost surely, 2^221001111001 is an apocalyptic number.

It is an amenable number.

221001111001 is a deficient number, since it is larger than the sum of its proper divisors (34707905639).

221001111001 is a wasteful number, since it uses less digits than its factorization.

221001111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2013944.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 221001111001 its reverse (100111100122), we get a palindrome (321112211123).

It can be divided in two parts, 22 and 1001111001, that multiplied together give a palindrome (22024442022).

The spelling of 221001111001 in words is "two hundred twenty-one billion, one million, one hundred eleven thousand, one".