221100321121 has 4 divisors (see below), whose sum is σ = 221117633044. Its totient is φ = 221083009200.

The previous prime is 221100321107. The next prime is 221100321137. The reversal of 221100321121 is 121123001122.

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

It can be written as a sum of positive squares in 2 ways, for example, as 128949219025 + 92151102096 = 359095^2 + 303564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221100321121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221100321095 and 221100321104.

It is not an unprimeable number, because it can be changed into a prime (221100321151) 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, 8636790 + ... + 8662351.

It is an arithmetic number, because the mean of its divisors is an integer number (55279408261).

Almost surely, 2^221100321121 is an apocalyptic number.

It is an amenable number.

221100321121 is a deficient number, since it is larger than the sum of its proper divisors (17311923).

221100321121 is a wasteful number, since it uses less digits than its factorization.

221100321121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17311922.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 221100321121 its reverse (121123001122), we get a palindrome (342223322243).

The spelling of 221100321121 in words is "two hundred twenty-one billion, one hundred million, three hundred twenty-one thousand, one hundred twenty-one".