210213221 has 2 divisors, whose sum is σ = 210213222. Its totient is φ = 210213220.

The previous prime is 210213173. The next prime is 210213271. The reversal of 210213221 is 122312012.

It is a happy number.

210213221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178516321 + 31696900 = 13361^2 + 5630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210213221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210213196 and 210213205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210213271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105106610 + 105106611.

It is an arithmetic number, because the mean of its divisors is an integer number (105106611).

Almost surely, 2^210213221 is an apocalyptic number.

It is an amenable number.

210213221 is a deficient number, since it is larger than the sum of its proper divisors (1).

210213221 is an equidigital number, since it uses as much as digits as its factorization.

210213221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 210213221 is about 14498.7317031525. The cubic root of 210213221 is about 594.5932969094.

Adding to 210213221 its reverse (122312012), we get a palindrome (332525233).

It can be divided in two parts, 21021 and 3221, that added together give a palindrome (24242).

The spelling of 210213221 in words is "two hundred ten million, two hundred thirteen thousand, two hundred twenty-one".