210211122221 has 8 divisors (see below), whose sum is σ = 210781410840. Its totient is φ = 209640987712.

The previous prime is 210211122203. The next prime is 210211122241. The reversal of 210211122221 is 122221112012.

210211122221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 15607504900 + 194603617321 = 124930^2 + 441139^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210211122221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210211122221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210211122241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3020411 + ... + 3089223.

It is an arithmetic number, because the mean of its divisors is an integer number (26347676355).

Almost surely, 2^210211122221 is an apocalyptic number.

It is an amenable number.

210211122221 is a deficient number, since it is larger than the sum of its proper divisors (570288619).

210211122221 is an equidigital number, since it uses as much as digits as its factorization.

210211122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77055.

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

Adding to 210211122221 its reverse (122221112012), we get a palindrome (332432234233).

The spelling of 210211122221 in words is "two hundred ten billion, two hundred eleven million, one hundred twenty-two thousand, two hundred twenty-one".