221020234679 has 2 divisors, whose sum is σ = 221020234680. Its totient is φ = 221020234678.

The previous prime is 221020234667. The next prime is 221020234693. The reversal of 221020234679 is 976432020122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221020234679 - 2²⁰ = 221019186103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221020234649) 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, 110510117339 + 110510117340.

It is an arithmetic number, because the mean of its divisors is an integer number (110510117340).

Almost surely, 2^221020234679 is an apocalyptic number.

221020234679 is a deficient number, since it is larger than the sum of its proper divisors (1).

221020234679 is an equidigital number, since it uses as much as digits as its factorization.

221020234679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 38.

The spelling of 221020234679 in words is "two hundred twenty-one billion, twenty million, two hundred thirty-four thousand, six hundred seventy-nine".