221121102202221 has 64 divisors (see below), whose sum is σ = 325424652779520. Its totient is φ = 132723353018880.

The previous prime is 221121102202219. The next prime is 221121102202283. The reversal of 221121102202221 is 122202201121122.

It is not a de Polignac number, because 221121102202221 - 2¹ = 221121102202219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121102202921) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4736222340 + ... + 4736269026.

It is an arithmetic number, because the mean of its divisors is an integer number (5084760199680).

Almost surely, 2^{221121102202221} is an apocalyptic number.

It is an amenable number.

221121102202221 is a deficient number, since it is larger than the sum of its proper divisors (104303550577299).

221121102202221 is a wasteful number, since it uses less digits than its factorization.

221121102202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65386.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 221121102202221 its reverse (122202201121122), we get a palindrome (343323303323343).

The spelling of 221121102202221 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, one hundred two million, two hundred two thousand, two hundred twenty-one".