221120001121 has 4 divisors (see below), whose sum is σ = 222444073152. Its totient is φ = 219795929092.

The previous prime is 221120001061. The next prime is 221120001149. The reversal of 221120001121 is 121100021122.

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 221120001121 - 2¹⁵ = 221119968353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221120002121) 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, 662035765 + ... + 662036098.

It is an arithmetic number, because the mean of its divisors is an integer number (55611018288).

Almost surely, 2^221120001121 is an apocalyptic number.

It is an amenable number.

221120001121 is a deficient number, since it is larger than the sum of its proper divisors (1324072031).

221120001121 is a wasteful number, since it uses less digits than its factorization.

221120001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324072030.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221120001121 its reverse (121100021122), we get a palindrome (342220022243).

The spelling of 221120001121 in words is "two hundred twenty-one billion, one hundred twenty million, one thousand, one hundred twenty-one".