221001221001111 has 32 divisors (see below), whose sum is σ = 315993767984640. Its totient is φ = 137115424043136.

The previous prime is 221001221001091. The next prime is 221001221001133. The reversal of 221001221001111 is 111100122100122.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-221001221001111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001221001151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 320474451 + ... + 321163316.

It is an arithmetic number, because the mean of its divisors is an integer number (9874805249520).

Almost surely, 2^{221001221001111} is an apocalyptic number.

221001221001111 is a deficient number, since it is larger than the sum of its proper divisors (94992546983529).

221001221001111 is a wasteful number, since it uses less digits than its factorization.

221001221001111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641637943.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221001221001111 its reverse (111100122100122), we get a palindrome (332101343101233).

The spelling of 221001221001111 in words is "two hundred twenty-one trillion, one billion, two hundred twenty-one million, one thousand, one hundred eleven".