10011211220221 has 2 divisors, whose sum is σ = 10011211220222. Its totient is φ = 10011211220220.

The previous prime is 10011211220201. The next prime is 10011211220239. The reversal of 10011211220221 is 12202211211001.

10011211220221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9209495131225 + 801716088996 = 3034715^2 + 895386^2 .

It is a cyclic number.

It is not a de Polignac number, because 10011211220221 - 2⁵ = 10011211220189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10011211220195 and 10011211220204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10011211220201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5005605610110 + 5005605610111.

It is an arithmetic number, because the mean of its divisors is an integer number (5005605610111).

Almost surely, 2^{10011211220221} is an apocalyptic number.

It is an amenable number.

10011211220221 is a deficient number, since it is larger than the sum of its proper divisors (1).

10011211220221 is an equidigital number, since it uses as much as digits as its factorization.

10011211220221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 10011211220221 its reverse (12202211211001), we get a palindrome (22213422431222).

The spelling of 10011211220221 in words is "ten trillion, eleven billion, two hundred eleven million, two hundred twenty thousand, two hundred twenty-one".