221233321111021 has 8 divisors (see below), whose sum is σ = 224264409446840. Its totient is φ = 218202246150912.

The previous prime is 221233321110983. The next prime is 221233321111067. The reversal of 221233321111021 is 120111123332122.

It can be written as a sum of positive squares in 4 ways, for example, as 46125001988521 + 175108319122500 = 6791539^2 + 13232850^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221233321111021 - 2¹¹ = 221233321108973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221233321115021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32589745 + ... + 38788633.

It is an arithmetic number, because the mean of its divisors is an integer number (28033051180855).

Almost surely, 2^{221233321111021} is an apocalyptic number.

It is an amenable number.

221233321111021 is a deficient number, since it is larger than the sum of its proper divisors (3031088335819).

221233321111021 is an equidigital number, since it uses as much as digits as its factorization.

221233321111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6687855.

The product of its (nonzero) digits is 864, while the sum is 25.

Adding to 221233321111021 its reverse (120111123332122), we get a palindrome (341344444443143).

The spelling of 221233321111021 in words is "two hundred twenty-one trillion, two hundred thirty-three billion, three hundred twenty-one million, one hundred eleven thousand, twenty-one".