221001221222111 has 16 divisors (see below), whose sum is σ = 241129263211008. Its totient is φ = 200879351870400.

The previous prime is 221001221222087. The next prime is 221001221222189. The reversal of 221001221222111 is 111222122100122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221001221222111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221001221225111) 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 15 ways as a sum of consecutive naturals, for example, 2718067520 + ... + 2718148826.

It is an arithmetic number, because the mean of its divisors is an integer number (15070578950688).

Almost surely, 2^{221001221222111} is an apocalyptic number.

221001221222111 is a deficient number, since it is larger than the sum of its proper divisors (20128041988897).

221001221222111 is a wasteful number, since it uses less digits than its factorization.

221001221222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116222.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221001221222111 its reverse (111222122100122), we get a palindrome (332223343322233).

The spelling of 221001221222111 in words is "two hundred twenty-one trillion, one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred eleven".