221201222011 has 16 divisors (see below), whose sum is σ = 275955752448. Its totient is φ = 172256832000.

The previous prime is 221201221987. The next prime is 221201222089. The reversal of 221201222011 is 110222102122.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-221201222011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221201222111) 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, 773895 + ... + 1020448.

It is an arithmetic number, because the mean of its divisors is an integer number (17247234528).

Almost surely, 2^221201222011 is an apocalyptic number.

221201222011 is a deficient number, since it is larger than the sum of its proper divisors (54754530437).

221201222011 is a wasteful number, since it uses less digits than its factorization.

221201222011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1795962.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221201222011 its reverse (110222102122), we get a palindrome (331423324133).

The spelling of 221201222011 in words is "two hundred twenty-one billion, two hundred one million, two hundred twenty-two thousand, eleven".