211210000122221 has 4 divisors (see below), whose sum is σ = 213583146191100. Its totient is φ = 208836854053344.

The previous prime is 211210000122169. The next prime is 211210000122263. The reversal of 211210000122221 is 122221000012112.

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 84331988730025 + 126878011392196 = 9183245^2 + 11264014^2 .

It is a cyclic number.

It is not a de Polignac number, because 211210000122221 - 2²⁶ = 211209933013357 is a prime.

It is a Duffinian number.

211210000122221 is a modest number, since divided by 122221 gives 21121 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 211210000122221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211210006122221) 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, 1186573034306 + ... + 1186573034483.

It is an arithmetic number, because the mean of its divisors is an integer number (53395786547775).

Almost surely, 2^{211210000122221} is an apocalyptic number.

It is an amenable number.

211210000122221 is a deficient number, since it is larger than the sum of its proper divisors (2373146068879).

211210000122221 is an equidigital number, since it uses as much as digits as its factorization.

211210000122221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2373146068878.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 211210000122221 its reverse (122221000012112), we get a palindrome (333431000134333).

The spelling of 211210000122221 in words is "two hundred eleven trillion, two hundred ten billion, one hundred twenty-two thousand, two hundred twenty-one".