221201220222221 has 8 divisors (see below), whose sum is σ = 223749941018040. Its totient is φ = 218653906400512.

The previous prime is 221201220222211. The next prime is 221201220222251. The reversal of 221201220222221 is 122222022102122.

It can be written as a sum of positive squares in 4 ways, for example, as 4963783482025 + 216237436740196 = 2227955^2 + 14705014^2 .

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-221201220222221 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 (221201220222211) 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, 351427280 + ... + 352056153.

It is an arithmetic number, because the mean of its divisors is an integer number (27968742627255).

Almost surely, 2^{221201220222221} is an apocalyptic number.

It is an amenable number.

221201220222221 is a deficient number, since it is larger than the sum of its proper divisors (2548720795819).

221201220222221 is an equidigital number, since it uses as much as digits as its factorization.

221201220222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703487055.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 221201220222221 its reverse (122222022102122), we get a palindrome (343423242324343).

The spelling of 221201220222221 in words is "two hundred twenty-one trillion, two hundred one billion, two hundred twenty million, two hundred twenty-two thousand, two hundred twenty-one".