221235203211 has 16 divisors (see below), whose sum is σ = 340725875328. Its totient is φ = 126194768000.

The previous prime is 221235203209. The next prime is 221235203221. The reversal of 221235203211 is 112302532122.

It is a cyclic number.

It is not a de Polignac number, because 221235203211 - 2¹ = 221235203209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221235203221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197178765 + ... + 197179886.

It is an arithmetic number, because the mean of its divisors is an integer number (21295367208).

Almost surely, 2^221235203211 is an apocalyptic number.

221235203211 is a deficient number, since it is larger than the sum of its proper divisors (119490672117).

221235203211 is a wasteful number, since it uses less digits than its factorization.

221235203211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394358682.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 221235203211 its reverse (112302532122), we get a palindrome (333537735333).

The spelling of 221235203211 in words is "two hundred twenty-one billion, two hundred thirty-five million, two hundred three thousand, two hundred eleven".