221202211121 has 16 divisors (see below), whose sum is σ = 230651608320. Its totient is φ = 211952657280.

The previous prime is 221202211099. The next prime is 221202211147. The reversal of 221202211121 is 121112202122.

It is not a de Polignac number, because 221202211121 - 2¹⁴ = 221202194737 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221202211121.

It is not an unprimeable number, because it can be changed into a prime (221202211151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2602136 + ... + 2685798.

It is an arithmetic number, because the mean of its divisors is an integer number (14415725520).

Almost surely, 2^221202211121 is an apocalyptic number.

It is an amenable number.

221202211121 is a deficient number, since it is larger than the sum of its proper divisors (9449397199).

221202211121 is a wasteful number, since it uses less digits than its factorization.

221202211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84856.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221202211121 its reverse (121112202122), we get a palindrome (342314413243).

The spelling of 221202211121 in words is "two hundred twenty-one billion, two hundred two million, two hundred eleven thousand, one hundred twenty-one".