210002202122221 has 4 divisors (see below), whose sum is σ = 210002283593212. Its totient is φ = 210002120651232.

The previous prime is 210002202122213. The next prime is 210002202122227. The reversal of 210002202122221 is 122221202200012.

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 209239523032996 + 762679089225 = 14465114^2 + 873315^2 .

It is a cyclic number.

It is not a de Polignac number, because 210002202122221 - 2³ = 210002202122213 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 (210002202122227) 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, 36738306 + ... + 42067891.

It is an arithmetic number, because the mean of its divisors is an integer number (52500570898303).

Almost surely, 2^{210002202122221} is an apocalyptic number.

It is an amenable number.

210002202122221 is a deficient number, since it is larger than the sum of its proper divisors (81470991).

210002202122221 is an equidigital number, since it uses as much as digits as its factorization.

210002202122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81470990.

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

Adding to 210002202122221 its reverse (122221202200012), we get a palindrome (332223404322233).

The spelling of 210002202122221 in words is "two hundred ten trillion, two billion, two hundred two million, one hundred twenty-two thousand, two hundred twenty-one".