221120212112021 has 4 divisors (see below), whose sum is σ = 221120247734412. Its totient is φ = 221120176489632.

The previous prime is 221120212112003. The next prime is 221120212112071. The reversal of 221120212112021 is 120211212021122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 76974495267121 + 144145716844900 = 8773511^2 + 12006070^2 .

It is a cyclic number.

It is not a de Polignac number, because 221120212112021 - 2¹⁴ = 221120212095637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221120212111984 and 221120212112002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221120212112071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5800406 + ... + 21814791.

It is an arithmetic number, because the mean of its divisors is an integer number (55280061933603).

Almost surely, 2^{221120212112021} is an apocalyptic number.

It is an amenable number.

221120212112021 is a deficient number, since it is larger than the sum of its proper divisors (35622391).

221120212112021 is an equidigital number, since it uses as much as digits as its factorization.

221120212112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35622390.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221120212112021 its reverse (120211212021122), we get a palindrome (341331424133143).

The spelling of 221120212112021 in words is "two hundred twenty-one trillion, one hundred twenty billion, two hundred twelve million, one hundred twelve thousand, twenty-one".