210210122221 has 4 divisors (see below), whose sum is σ = 229320133344. Its totient is φ = 191100111100.

The previous prime is 210210122159. The next prime is 210210122231. The reversal of 210210122221 is 122221012012.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210210122221 - 2⁷ = 210210122093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210210122195 and 210210122204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210210122231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9555005545 + ... + 9555005566.

It is an arithmetic number, because the mean of its divisors is an integer number (57330033336).

Almost surely, 2^210210122221 is an apocalyptic number.

It is an amenable number.

210210122221 is a deficient number, since it is larger than the sum of its proper divisors (19110011123).

210210122221 is a wasteful number, since it uses less digits than its factorization.

210210122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19110011122.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 210210122221 its reverse (122221012012), we get a palindrome (332431134233).

The spelling of 210210122221 in words is "two hundred ten billion, two hundred ten million, one hundred twenty-two thousand, two hundred twenty-one".