220221020200021 has 4 divisors (see below), whose sum is σ = 220247652330700. Its totient is φ = 220194388069344.

The previous prime is 220221020199967. The next prime is 220221020200057. The reversal of 220221020200021 is 120002020122022.

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 205474736672100 + 14746283527921 = 14334390^2 + 3840089^2 .

It is a cyclic number.

It is not a de Polignac number, because 220221020200021 - 2¹³ = 220221020191829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220221020199968 and 220221020200004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220221020200091) 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, 13316052936 + ... + 13316069473.

It is an arithmetic number, because the mean of its divisors is an integer number (55061913082675).

Almost surely, 2^{220221020200021} is an apocalyptic number.

It is an amenable number.

220221020200021 is a deficient number, since it is larger than the sum of its proper divisors (26632130679).

220221020200021 is an equidigital number, since it uses as much as digits as its factorization.

220221020200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26632130678.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 220221020200021 its reverse (120002020122022), we get a palindrome (340223040322043).

The spelling of 220221020200021 in words is "two hundred twenty trillion, two hundred twenty-one billion, twenty million, two hundred thousand, twenty-one".