10211208221 has 2 divisors, whose sum is σ = 10211208222. Its totient is φ = 10211208220.

The previous prime is 10211208197. The next prime is 10211208223. The reversal of 10211208221 is 12280211201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8084707225 + 2126500996 = 89915^2 + 46114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10211208221 is a prime.

Together with 10211208223, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 10211208193 and 10211208202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10211208223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105604110 + 5105604111.

It is an arithmetic number, because the mean of its divisors is an integer number (5105604111).

Almost surely, 2^10211208221 is an apocalyptic number.

It is an amenable number.

10211208221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10211208221 is an equidigital number, since it uses as much as digits as its factorization.

10211208221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 10211208221 its reverse (12280211201), we get a palindrome (22491419422).

The spelling of 10211208221 in words is "ten billion, two hundred eleven million, two hundred eight thousand, two hundred twenty-one".