10122221 has 2 divisors, whose sum is σ = 10122222. Its totient is φ = 10122220.

The previous prime is 10122209. The next prime is 10122223. The reversal of 10122221 is 12222101.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8934121 + 1188100 = 2989^2 + 1090^2 .

It is an emirp because it is prime and its reverse (12222101) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10122221 is a prime.

Together with 10122223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10122223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5061110 + 5061111.

It is an arithmetic number, because the mean of its divisors is an integer number (5061111).

Almost surely, 2^10122221 is an apocalyptic number.

It is an amenable number.

10122221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10122221 is an equidigital number, since it uses as much as digits as its factorization.

10122221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 10122221 is about 3181.5438076506. The cubic root of 10122221 is about 216.3176410854.

Adding to 10122221 its reverse (12222101), we get a palindrome (22344322).

It can be divided in two parts, 101 and 22221, that added together give a palindrome (22322).

The spelling of 10122221 in words is "ten million, one hundred twenty-two thousand, two hundred twenty-one".