210220081 has 2 divisors, whose sum is σ = 210220082. Its totient is φ = 210220080.

The previous prime is 210220063. The next prime is 210220099. The reversal of 210220081 is 180022012.

It is a balanced prime because it is at equal distance from previous prime (210220063) and next prime (210220099).

It can be written as a sum of positive squares in only one way, i.e., 194853681 + 15366400 = 13959^2 + 3920^2 .

It is a cyclic number.

It is not a de Polignac number, because 210220081 - 2⁷ = 210219953 is a prime.

It is a super-2 number, since 2×210220081² = 88384964911293122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (210223081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105110040 + 105110041.

It is an arithmetic number, because the mean of its divisors is an integer number (105110041).

Almost surely, 2^210220081 is an apocalyptic number.

It is an amenable number.

210220081 is a deficient number, since it is larger than the sum of its proper divisors (1).

210220081 is an equidigital number, since it uses as much as digits as its factorization.

210220081 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 16.

The square root of 210220081 is about 14498.9682736393. The cubic root of 210220081 is about 594.5997647323.

Adding to 210220081 its reverse (180022012), we get a palindrome (390242093).

The spelling of 210220081 in words is "two hundred ten million, two hundred twenty thousand, eighty-one".