221201000121 has 4 divisors (see below), whose sum is σ = 294934666832. Its totient is φ = 147467333412.

The previous prime is 221201000117. The next prime is 221201000161. The reversal of 221201000121 is 121000102122.

221201000121 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 not a de Polignac number, because 221201000121 - 2² = 221201000117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221201000097 and 221201000106.

It is not an unprimeable number, because it can be changed into a prime (221201000161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36866833351 + ... + 36866833356.

It is an arithmetic number, because the mean of its divisors is an integer number (73733666708).

Almost surely, 2^221201000121 is an apocalyptic number.

It is an amenable number.

221201000121 is a deficient number, since it is larger than the sum of its proper divisors (73733666711).

221201000121 is an equidigital number, since it uses as much as digits as its factorization.

221201000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73733666710.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 221201000121 its reverse (121000102122), we get a palindrome (342201102243).

The spelling of 221201000121 in words is "two hundred twenty-one billion, two hundred one million, one hundred twenty-one", and thus it is an aban number.