221202112120111 has 4 divisors (see below), whose sum is σ = 230819595255792. Its totient is φ = 211584628984432.

The previous prime is 221202112120109. The next prime is 221202112120123. The reversal of 221202112120111 is 111021211202122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221202112120111 - 2¹ = 221202112120109 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 (221202112120211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4808741567806 + ... + 4808741567851.

It is an arithmetic number, because the mean of its divisors is an integer number (57704898813948).

Almost surely, 2^{221202112120111} is an apocalyptic number.

221202112120111 is a deficient number, since it is larger than the sum of its proper divisors (9617483135681).

221202112120111 is an equidigital number, since it uses as much as digits as its factorization.

221202112120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9617483135680.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 221202112120111 its reverse (111021211202122), we get a palindrome (332223323322233).

The spelling of 221202112120111 in words is "two hundred twenty-one trillion, two hundred two billion, one hundred twelve million, one hundred twenty thousand, one hundred eleven".