221201222221001 has 16 divisors (see below), whose sum is σ = 254033508277440. Its totient is φ = 190491328120320.

The previous prime is 221201222220931. The next prime is 221201222221061. The reversal of 221201222221001 is 100122222102122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221201222221001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221201222221061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44587040 + ... + 49299153.

It is an arithmetic number, because the mean of its divisors is an integer number (15877094267340).

Almost surely, 2^{221201222221001} is an apocalyptic number.

It is an amenable number.

221201222221001 is a deficient number, since it is larger than the sum of its proper divisors (32832286056439).

221201222221001 is a wasteful number, since it uses less digits than its factorization.

221201222221001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93897496.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221201222221001 its reverse (100122222102122), we get a palindrome (321323444323123).

The spelling of 221201222221001 in words is "two hundred twenty-one trillion, two hundred one billion, two hundred twenty-two million, two hundred twenty-one thousand, one".