210002221 has 8 divisors (see below), whose sum is σ = 246716064. Its totient is φ = 176225520.

The previous prime is 210002209. The next prime is 210002227. The reversal of 210002221 is 122200012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 210002221 - 2⁵ = 210002189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210002198 and 210002207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210002227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 734131 + ... + 734416.

It is an arithmetic number, because the mean of its divisors is an integer number (30839508).

Almost surely, 2^210002221 is an apocalyptic number.

It is an amenable number.

210002221 is a deficient number, since it is larger than the sum of its proper divisors (36713843).

210002221 is a wasteful number, since it uses less digits than its factorization.

210002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468571.

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

The square root of 210002221 is about 14491.4533777672. The cubic root of 210002221 is about 594.3942907373.

Adding to 210002221 its reverse (122200012), we get a palindrome (332202233).

The spelling of 210002221 in words is "two hundred ten million, two thousand, two hundred twenty-one".