211210323221 has 2 divisors, whose sum is σ = 211210323222. Its totient is φ = 211210323220.

The previous prime is 211210323209. The next prime is 211210323281. The reversal of 211210323221 is 122323012112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 206924002321 + 4286320900 = 454889^2 + 65470^2 .

It is a cyclic number.

It is not a de Polignac number, because 211210323221 - 2⁶ = 211210323157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211210323193 and 211210323202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211210323281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105605161610 + 105605161611.

It is an arithmetic number, because the mean of its divisors is an integer number (105605161611).

Almost surely, 2^211210323221 is an apocalyptic number.

It is an amenable number.

211210323221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211210323221 is an equidigital number, since it uses as much as digits as its factorization.

211210323221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 211210323221 its reverse (122323012112), we get a palindrome (333533335333).

The spelling of 211210323221 in words is "two hundred eleven billion, two hundred ten million, three hundred twenty-three thousand, two hundred twenty-one".