221321113206 has 32 divisors (see below), whose sum is σ = 443994939648. Its totient is φ = 73548557280.

The previous prime is 221321113177. The next prime is 221321113213. The reversal of 221321113206 is 602311123122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2922601 + ... + 2997371.

It is an arithmetic number, because the mean of its divisors is an integer number (13874841864).

Almost surely, 2^221321113206 is an apocalyptic number.

221321113206 is an abundant number, since it is smaller than the sum of its proper divisors (222673826442).

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

221321113206 is a wasteful number, since it uses less digits than its factorization.

221321113206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76276.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 221321113206 its reverse (602311123122), we get a palindrome (823632236328).

The spelling of 221321113206 in words is "two hundred twenty-one billion, three hundred twenty-one million, one hundred thirteen thousand, two hundred six".