221211120121 has 4 divisors (see below), whose sum is σ = 224960461200. Its totient is φ = 217461779044.

The previous prime is 221211120113. The next prime is 221211120149. The reversal of 221211120121 is 121021112122.

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 221211120121 - 2³ = 221211120113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221211120095 and 221211120104.

It is not an unprimeable number, because it can be changed into a prime (221211120191) 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, 1874670451 + ... + 1874670568.

It is an arithmetic number, because the mean of its divisors is an integer number (56240115300).

Almost surely, 2^221211120121 is an apocalyptic number.

It is an amenable number.

221211120121 is a deficient number, since it is larger than the sum of its proper divisors (3749341079).

221211120121 is an equidigital number, since it uses as much as digits as its factorization.

221211120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3749341078.

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

Adding to 221211120121 its reverse (121021112122), we get a palindrome (342232232243).

The spelling of 221211120121 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred twenty thousand, one hundred twenty-one".