220321110221021 has 2 divisors, whose sum is σ = 220321110221022. Its totient is φ = 220321110221020.

The previous prime is 220321110220993. The next prime is 220321110221101. The reversal of 220321110221021 is 120122011123022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 186811900447225 + 33509209773796 = 13667915^2 + 5788714^2 .

It is a cyclic number.

It is not a de Polignac number, because 220321110221021 - 2⁴² = 215923063709917 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 220321110220984 and 220321110221002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220321110221221) 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 as a sum of consecutive naturals, namely, 110160555110510 + 110160555110511.

It is an arithmetic number, because the mean of its divisors is an integer number (110160555110511).

Almost surely, 2^{220321110221021} is an apocalyptic number.

It is an amenable number.

220321110221021 is a deficient number, since it is larger than the sum of its proper divisors (1).

220321110221021 is an equidigital number, since it uses as much as digits as its factorization.

220321110221021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 220321110221021 its reverse (120122011123022), we get a palindrome (340443121344043).

The spelling of 220321110221021 in words is "two hundred twenty trillion, three hundred twenty-one billion, one hundred ten million, two hundred twenty-one thousand, twenty-one".