221120211021 has 4 divisors (see below), whose sum is σ = 294826948032. Its totient is φ = 147413474012.

The previous prime is 221120210981. The next prime is 221120211047. The reversal of 221120211021 is 120112021122.

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 221120211021 - 2¹⁴ = 221120194637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221120211821) 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, 36853368501 + ... + 36853368506.

It is an arithmetic number, because the mean of its divisors is an integer number (73706737008).

Almost surely, 2^221120211021 is an apocalyptic number.

It is an amenable number.

221120211021 is a deficient number, since it is larger than the sum of its proper divisors (73706737011).

221120211021 is an equidigital number, since it uses as much as digits as its factorization.

221120211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73706737010.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221120211021 its reverse (120112021122), we get a palindrome (341232232143).

The spelling of 221120211021 in words is "two hundred twenty-one billion, one hundred twenty million, two hundred eleven thousand, twenty-one".