1011211020221 has 2 divisors, whose sum is σ = 1011211020222. Its totient is φ = 1011211020220.

The previous prime is 1011211020151. The next prime is 1011211020229. The reversal of 1011211020221 is 1220201121101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1008797263321 + 2413756900 = 1004389^2 + 49130^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011211020221 - 2¹⁰ = 1011211019197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1011211020196 and 1011211020205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011211020229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505605510110 + 505605510111.

It is an arithmetic number, because the mean of its divisors is an integer number (505605510111).

Almost surely, 2^{1011211020221} is an apocalyptic number.

It is an amenable number.

1011211020221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011211020221 is an equidigital number, since it uses as much as digits as its factorization.

1011211020221 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 14.

Adding to 1011211020221 its reverse (1220201121101), we get a palindrome (2231412141322).

The spelling of 1011211020221 in words is "one trillion, eleven billion, two hundred eleven million, twenty thousand, two hundred twenty-one".