221421203615713 has 2 divisors, whose sum is σ = 221421203615714. Its totient is φ = 221421203615712.

The previous prime is 221421203615629. The next prime is 221421203615747. The reversal of 221421203615713 is 317516302124122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188805819679569 + 32615383936144 = 13740663^2 + 5710988^2 .

It is a cyclic number.

It is not a de Polignac number, because 221421203615713 - 2²⁹ = 221420666744801 is a prime.

It is not a weakly prime, because it can be changed into another prime (221421203615783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110710601807856 + 110710601807857.

It is an arithmetic number, because the mean of its divisors is an integer number (110710601807857).

Almost surely, 2^{221421203615713} is an apocalyptic number.

It is an amenable number.

221421203615713 is a deficient number, since it is larger than the sum of its proper divisors (1).

221421203615713 is an equidigital number, since it uses as much as digits as its factorization.

221421203615713 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 40.

Adding to 221421203615713 its reverse (317516302124122), we get a palindrome (538937505739835).

The spelling of 221421203615713 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred three million, six hundred fifteen thousand, seven hundred thirteen".