221131204206 has 16 divisors (see below), whose sum is σ = 482468082048. Its totient is φ = 67009455800.

The previous prime is 221131204199. The next prime is 221131204207. The reversal of 221131204206 is 602402131122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221131204207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1675236330 + ... + 1675236461.

It is an arithmetic number, because the mean of its divisors is an integer number (30154255128).

Almost surely, 2^221131204206 is an apocalyptic number.

221131204206 is an abundant number, since it is smaller than the sum of its proper divisors (261336877842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221131204206 is a wasteful number, since it uses less digits than its factorization.

221131204206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3350472807.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 221131204206 its reverse (602402131122), we get a palindrome (823533335328).

The spelling of 221131204206 in words is "two hundred twenty-one billion, one hundred thirty-one million, two hundred four thousand, two hundred six".