220021002001 has 2 divisors, whose sum is σ = 220021002002. Its totient is φ = 220021002000.

The previous prime is 220021001899. The next prime is 220021002043. The reversal of 220021002001 is 100200120022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181006851601 + 39014150400 = 425449^2 + 197520^2 .

It is a cyclic number.

It is not a de Polignac number, because 220021002001 - 2⁷ = 220021001873 is a prime.

It is not a weakly prime, because it can be changed into another prime (220021002401) 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, 110010501000 + 110010501001.

It is an arithmetic number, because the mean of its divisors is an integer number (110010501001).

Almost surely, 2^220021002001 is an apocalyptic number.

It is an amenable number.

220021002001 is a deficient number, since it is larger than the sum of its proper divisors (1).

220021002001 is an equidigital number, since it uses as much as digits as its factorization.

220021002001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 220021002001 its reverse (100200120022), we get a palindrome (320221122023).

The spelling of 220021002001 in words is "two hundred twenty billion, twenty-one million, two thousand, one".