221305252897 has 2 divisors, whose sum is σ = 221305252898. Its totient is φ = 221305252896.

The previous prime is 221305252823. The next prime is 221305252913. The reversal of 221305252897 is 798252503122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145371388176 + 75933864721 = 381276^2 + 275561^2 .

It is a cyclic number.

It is not a de Polignac number, because 221305252897 - 2¹¹ = 221305250849 is a prime.

It is not a weakly prime, because it can be changed into another prime (221305252807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110652626448 + 110652626449.

It is an arithmetic number, because the mean of its divisors is an integer number (110652626449).

Almost surely, 2^221305252897 is an apocalyptic number.

It is an amenable number.

221305252897 is a deficient number, since it is larger than the sum of its proper divisors (1).

221305252897 is an equidigital number, since it uses as much as digits as its factorization.

221305252897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 604800, while the sum is 46.

The spelling of 221305252897 in words is "two hundred twenty-one billion, three hundred five million, two hundred fifty-two thousand, eight hundred ninety-seven".