10211225221 has 2 divisors, whose sum is σ = 10211225222. Its totient is φ = 10211225220.

The previous prime is 10211225197. The next prime is 10211225243. The reversal of 10211225221 is 12252211201.

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., 8119992321 + 2091232900 = 90111^2 + 45730^2 .

It is an emirp because it is prime and its reverse (12252211201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10211225221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10211225261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105612610 + 5105612611.

It is an arithmetic number, because the mean of its divisors is an integer number (5105612611).

Almost surely, 2^10211225221 is an apocalyptic number.

It is an amenable number.

10211225221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10211225221 is an equidigital number, since it uses as much as digits as its factorization.

10211225221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 19.

Adding to 10211225221 its reverse (12252211201), we get a palindrome (22463436422).

The spelling of 10211225221 in words is "ten billion, two hundred eleven million, two hundred twenty-five thousand, two hundred twenty-one".