220000120220021 has 4 divisors (see below), whose sum is σ = 220001032367532. Its totient is φ = 219999208072512.

The previous prime is 220000120220017. The next prime is 220000120220063. The reversal of 220000120220021 is 120022021000022.

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 67319153280625 + 152680966939396 = 8204825^2 + 12356414^2 .

It is a cyclic number.

It is not a de Polignac number, because 220000120220021 - 2² = 220000120220017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 220000120219978 and 220000120220005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220000120220011) 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 in 3 ways as a sum of consecutive naturals, for example, 455711876 + ... + 456194381.

It is an arithmetic number, because the mean of its divisors is an integer number (55000258091883).

Almost surely, 2^{220000120220021} is an apocalyptic number.

It is an amenable number.

220000120220021 is a deficient number, since it is larger than the sum of its proper divisors (912147511).

220000120220021 is an equidigital number, since it uses as much as digits as its factorization.

220000120220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912147510.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 220000120220021 its reverse (120022021000022), we get a palindrome (340022141220043).

The spelling of 220000120220021 in words is "two hundred twenty trillion, one hundred twenty million, two hundred twenty thousand, twenty-one".