210222221081 has 2 divisors, whose sum is σ = 210222221082. Its totient is φ = 210222221080.

The previous prime is 210222221071. The next prime is 210222221107. The reversal of 210222221081 is 180122222012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185515411225 + 24706809856 = 430715^2 + 157184^2 .

It is a cyclic number.

It is not a de Polignac number, because 210222221081 - 2¹⁰ = 210222220057 is a prime.

It is a super-2 number, since 2×210222221081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (210222221071) 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, 105111110540 + 105111110541.

It is an arithmetic number, because the mean of its divisors is an integer number (105111110541).

Almost surely, 2^210222221081 is an apocalyptic number.

It is an amenable number.

210222221081 is a deficient number, since it is larger than the sum of its proper divisors (1).

210222221081 is an equidigital number, since it uses as much as digits as its factorization.

210222221081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 210222221081 its reverse (180122222012), we get a palindrome (390344443093).

The spelling of 210222221081 in words is "two hundred ten billion, two hundred twenty-two million, two hundred twenty-one thousand, eighty-one".