221220001121 has 4 divisors (see below), whose sum is σ = 252822858432. Its totient is φ = 189617143812.

The previous prime is 221220001109. The next prime is 221220001147. The reversal of 221220001121 is 121100022122.

221220001121 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 cyclic number.

It is not a de Polignac number, because 221220001121 - 2³⁴ = 204040131937 is a prime.

It is a super-4 number, since 4×221220001121⁴ (a number of 46 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221220001096 and 221220001105.

It is not an unprimeable number, because it can be changed into a prime (221220001181) 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, 15801428645 + ... + 15801428658.

It is an arithmetic number, because the mean of its divisors is an integer number (63205714608).

Almost surely, 2^221220001121 is an apocalyptic number.

It is an amenable number.

221220001121 is a deficient number, since it is larger than the sum of its proper divisors (31602857311).

221220001121 is an equidigital number, since it uses as much as digits as its factorization.

221220001121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31602857310.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221220001121 its reverse (121100022122), we get a palindrome (342320023243).

The spelling of 221220001121 in words is "two hundred twenty-one billion, two hundred twenty million, one thousand, one hundred twenty-one".