221102320121 has 4 divisors (see below), whose sum is σ = 221104073892. Its totient is φ = 221100566352.

The previous prime is 221102320091. The next prime is 221102320129. The reversal of 221102320121 is 121023201122.

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 92820152896 + 128282167225 = 304664^2 + 358165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221102320121 is a prime.

It is a super-2 number, since 2×221102320121² (a number of 23 digits) contains 22 as substring.

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 221102320121.

It is not an unprimeable number, because it can be changed into a prime (221102320129) 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, 671786 + ... + 945251.

It is an arithmetic number, because the mean of its divisors is an integer number (55276018473).

Almost surely, 2^221102320121 is an apocalyptic number.

It is an amenable number.

221102320121 is a deficient number, since it is larger than the sum of its proper divisors (1753771).

221102320121 is a wasteful number, since it uses less digits than its factorization.

221102320121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1753770.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 221102320121 its reverse (121023201122), we get a palindrome (342125521243).

The spelling of 221102320121 in words is "two hundred twenty-one billion, one hundred two million, three hundred twenty thousand, one hundred twenty-one".