221020222220201 has 2 divisors, whose sum is σ = 221020222220202. Its totient is φ = 221020222220200.

The previous prime is 221020222220191. The next prime is 221020222220233. The reversal of 221020222220201 is 102022222020122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120128724105625 + 100891498114576 = 10960325^2 + 10044476^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221020222220201 is a prime.

It is not a weakly prime, because it can be changed into another prime (221020222220101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510111110100 + 110510111110101.

It is an arithmetic number, because the mean of its divisors is an integer number (110510111110101).

Almost surely, 2^{221020222220201} is an apocalyptic number.

It is an amenable number.

221020222220201 is a deficient number, since it is larger than the sum of its proper divisors (1).

221020222220201 is an equidigital number, since it uses as much as digits as its factorization.

221020222220201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 221020222220201 its reverse (102022222020122), we get a palindrome (323042444240323).

It can be divided in two parts, 22 and 1020222220201, that multiplied together give a palindrome (22444888844422).

The spelling of 221020222220201 in words is "two hundred twenty-one trillion, twenty billion, two hundred twenty-two million, two hundred twenty thousand, two hundred one".