10121100221 has 2 divisors, whose sum is σ = 10121100222. Its totient is φ = 10121100220.

The previous prime is 10121100191. The next prime is 10121100271. The reversal of 10121100221 is 12200112101.

10121100221 is digitally balanced in base 3, 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., 6270897721 + 3850202500 = 79189^2 + 62050^2 .

It is a cyclic number.

It is not a de Polignac number, because 10121100221 - 2²² = 10116905917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10121100271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5060550110 + 5060550111.

It is an arithmetic number, because the mean of its divisors is an integer number (5060550111).

Almost surely, 2^10121100221 is an apocalyptic number.

It is an amenable number.

10121100221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10121100221 is an equidigital number, since it uses as much as digits as its factorization.

10121100221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 10121100221 its reverse (12200112101), we get a palindrome (22321212322).

The spelling of 10121100221 in words is "ten billion, one hundred twenty-one million, one hundred thousand, two hundred twenty-one".