210122222221 has 4 divisors (see below), whose sum is σ = 210180706812. Its totient is φ = 210063737632.

The previous prime is 210122222203. The next prime is 210122222227. The reversal of 210122222221 is 122222221012.

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 75411201321 + 134711020900 = 274611^2 + 367030^2 .

It is a cyclic number.

It is not a de Polignac number, because 210122222221 - 2⁹ = 210122221709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210122222227) 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 in 3 ways as a sum of consecutive naturals, for example, 29236906 + ... + 29244091.

It is an arithmetic number, because the mean of its divisors is an integer number (52545176703).

Almost surely, 2^210122222221 is an apocalyptic number.

It is an amenable number.

210122222221 is a deficient number, since it is larger than the sum of its proper divisors (58484591).

210122222221 is an equidigital number, since it uses as much as digits as its factorization.

210122222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58484590.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 210122222221 its reverse (122222221012), we get a palindrome (332344443233).

The spelling of 210122222221 in words is "two hundred ten billion, one hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".