221321203201 has 12 divisors (see below), whose sum is σ = 271005556080. Its totient is φ = 179719472520.

The previous prime is 221321203157. The next prime is 221321203211. The reversal of 221321203201 is 102302123122.

It is not a de Polignac number, because 221321203201 - 2⁷ = 221321203073 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (221321203211) 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 11 ways as a sum of consecutive naturals, for example, 118861155 + ... + 118863016.

It is an arithmetic number, because the mean of its divisors is an integer number (22583796340).

Almost surely, 2^221321203201 is an apocalyptic number.

It is an amenable number.

221321203201 is a deficient number, since it is larger than the sum of its proper divisors (49684352879).

221321203201 is a wasteful number, since it uses less digits than its factorization.

221321203201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237724204 (or 237724197 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 221321203201 its reverse (102302123122), we get a palindrome (323623326323).

The spelling of 221321203201 in words is "two hundred twenty-one billion, three hundred twenty-one million, two hundred three thousand, two hundred one".