221131312200221 has 4 divisors (see below), whose sum is σ = 228264580335744. Its totient is φ = 213998044064700.

The previous prime is 221131312200191. The next prime is 221131312200223. The reversal of 221131312200221 is 122002213131122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221131312200221 - 2¹⁰ = 221131312199197 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 (221131312200223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3566634067715 + ... + 3566634067776.

It is an arithmetic number, because the mean of its divisors is an integer number (57066145083936).

Almost surely, 2^{221131312200221} is an apocalyptic number.

It is an amenable number.

221131312200221 is a deficient number, since it is larger than the sum of its proper divisors (7133268135523).

221131312200221 is an equidigital number, since it uses as much as digits as its factorization.

221131312200221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7133268135522.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 221131312200221 its reverse (122002213131122), we get a palindrome (343133525331343).

The spelling of 221131312200221 in words is "two hundred twenty-one trillion, one hundred thirty-one billion, three hundred twelve million, two hundred thousand, two hundred twenty-one".