101221020221 has 2 divisors, whose sum is σ = 101221020222. Its totient is φ = 101221020220.

The previous prime is 101221020163. The next prime is 101221020253. The reversal of 101221020221 is 122020122101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86207419321 + 15013600900 = 293611^2 + 122530^2 .

It is a cyclic number.

It is not a de Polignac number, because 101221020221 - 2¹⁴ = 101221003837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 101221020196 and 101221020205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101221020721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50610510110 + 50610510111.

It is an arithmetic number, because the mean of its divisors is an integer number (50610510111).

Almost surely, 2^101221020221 is an apocalyptic number.

It is an amenable number.

101221020221 is a deficient number, since it is larger than the sum of its proper divisors (1).

101221020221 is an equidigital number, since it uses as much as digits as its factorization.

101221020221 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 14.

Adding to 101221020221 its reverse (122020122101), we get a palindrome (223241142322).

The spelling of 101221020221 in words is "one hundred one billion, two hundred twenty-one million, twenty thousand, two hundred twenty-one".