221201232221 has 8 divisors (see below), whose sum is σ = 223987667904. Its totient is φ = 218417686240.

The previous prime is 221201232209. The next prime is 221201232257. The reversal of 221201232221 is 122232102122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221201232221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221201232193 and 221201232202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221201232521) 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, 568160 + ... + 874761.

It is an arithmetic number, because the mean of its divisors is an integer number (27998458488).

Almost surely, 2^221201232221 is an apocalyptic number.

It is an amenable number.

221201232221 is a deficient number, since it is larger than the sum of its proper divisors (2786435683).

221201232221 is a wasteful number, since it uses less digits than its factorization.

221201232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1444851.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 221201232221 its reverse (122232102122), we get a palindrome (343433334343).

The spelling of 221201232221 in words is "two hundred twenty-one billion, two hundred one million, two hundred thirty-two thousand, two hundred twenty-one".