2220220021 has 2 divisors, whose sum is σ = 2220220022. Its totient is φ = 2220220020.

The previous prime is 2220219943. The next prime is 2220220027. The reversal of 2220220021 is 1200220222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1386743121 + 833476900 = 37239^2 + 28870^2 .

It is a cyclic number.

It is not a de Polignac number, because 2220220021 - 2¹¹ = 2220217973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2220219983 and 2220220010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2220220027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110110010 + 1110110011.

It is an arithmetic number, because the mean of its divisors is an integer number (1110110011).

Almost surely, 2^2220220021 is an apocalyptic number.

It is an amenable number.

2220220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2220220021 is an equidigital number, since it uses as much as digits as its factorization.

2220220021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 2220220021 is about 47119.2107425411. The cubic root of 2220220021 is about 1304.5638449872.

Adding to 2220220021 its reverse (1200220222), we get a palindrome (3420440243).

The spelling of 2220220021 in words is "two billion, two hundred twenty million, two hundred twenty thousand, twenty-one".