21221020222201 has 2 divisors, whose sum is σ = 21221020222202. Its totient is φ = 21221020222200.

The previous prime is 21221020222187. The next prime is 21221020222217. The reversal of 21221020222201 is 10222202012212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19910336410000 + 1310683812201 = 4462100^2 + 1144851^2 .

It is a cyclic number.

It is not a de Polignac number, because 21221020222201 - 2⁹ = 21221020221689 is a prime.

It is not a weakly prime, because it can be changed into another prime (21221020222231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610510111100 + 10610510111101.

It is an arithmetic number, because the mean of its divisors is an integer number (10610510111101).

Almost surely, 2^{21221020222201} is an apocalyptic number.

It is an amenable number.

21221020222201 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221020222201 is an equidigital number, since it uses as much as digits as its factorization.

21221020222201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21221020222201 its reverse (10222202012212), we get a palindrome (31443222234413).

The spelling of 21221020222201 in words is "twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred twenty-two thousand, two hundred one".