221102001220121 has 4 divisors (see below), whose sum is σ = 252688001394432. Its totient is φ = 189516001045812.

The previous prime is 221102001220063. The next prime is 221102001220123. The reversal of 221102001220121 is 121022100201122.

221102001220121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-221102001220121 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 221102001220121.

It is not an unprimeable number, because it can be changed into a prime (221102001220123) 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, 15793000087145 + ... + 15793000087158.

It is an arithmetic number, because the mean of its divisors is an integer number (63172000348608).

Almost surely, 2^{221102001220121} is an apocalyptic number.

It is an amenable number.

221102001220121 is a deficient number, since it is larger than the sum of its proper divisors (31586000174311).

221102001220121 is an equidigital number, since it uses as much as digits as its factorization.

221102001220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31586000174310.

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

Adding to 221102001220121 its reverse (121022100201122), we get a palindrome (342124101421243).

The spelling of 221102001220121 in words is "two hundred twenty-one trillion, one hundred two billion, one million, two hundred twenty thousand, one hundred twenty-one".