221001021201121 has 4 divisors (see below), whose sum is σ = 252572595658432. Its totient is φ = 189429446743812.

The previous prime is 221001021201097. The next prime is 221001021201137. The reversal of 221001021201121 is 121102120100122.

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 cyclic number.

It is not a de Polignac number, because 221001021201121 - 2⁵ = 221001021201089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221001021201095 and 221001021201104.

It is not an unprimeable number, because it can be changed into a prime (221001021601121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15785787228645 + ... + 15785787228658.

It is an arithmetic number, because the mean of its divisors is an integer number (63143148914608).

Almost surely, 2^{221001021201121} is an apocalyptic number.

It is an amenable number.

221001021201121 is a deficient number, since it is larger than the sum of its proper divisors (31571574457311).

221001021201121 is an equidigital number, since it uses as much as digits as its factorization.

221001021201121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31571574457310.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221001021201121 its reverse (121102120100122), we get a palindrome (342103141301243).

The spelling of 221001021201121 in words is "two hundred twenty-one trillion, one billion, twenty-one million, two hundred one thousand, one hundred twenty-one".