221020022122421 has 2 divisors, whose sum is σ = 221020022122422. Its totient is φ = 221020022122420.

The previous prime is 221020022122391. The next prime is 221020022122441. The reversal of 221020022122421 is 124221220020122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134382833554321 + 86637188568100 = 11592361^2 + 9307910^2 .

It is a cyclic number.

It is not a de Polignac number, because 221020022122421 - 2⁶ = 221020022122357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221020022122441) 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, 110510011061210 + 110510011061211.

It is an arithmetic number, because the mean of its divisors is an integer number (110510011061211).

Almost surely, 2^{221020022122421} is an apocalyptic number.

It is an amenable number.

221020022122421 is a deficient number, since it is larger than the sum of its proper divisors (1).

221020022122421 is an equidigital number, since it uses as much as digits as its factorization.

221020022122421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 221020022122421 its reverse (124221220020122), we get a palindrome (345241242142543).

The spelling of 221020022122421 in words is "two hundred twenty-one trillion, twenty billion, twenty-two million, one hundred twenty-two thousand, four hundred twenty-one".