221646267352057 has 2 divisors, whose sum is σ = 221646267352058. Its totient is φ = 221646267352056.

The previous prime is 221646267351997. The next prime is 221646267352187. The reversal of 221646267352057 is 750253762646122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177204525088761 + 44441742263296 = 13311819^2 + 6666464^2 .

It is a cyclic number.

It is not a de Polignac number, because 221646267352057 - 2¹¹ = 221646267350009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221646267351992 and 221646267352010.

It is not a weakly prime, because it can be changed into another prime (221646268352057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110823133676028 + 110823133676029.

It is an arithmetic number, because the mean of its divisors is an integer number (110823133676029).

Almost surely, 2^{221646267352057} is an apocalyptic number.

It is an amenable number.

221646267352057 is a deficient number, since it is larger than the sum of its proper divisors (1).

221646267352057 is an equidigital number, since it uses as much as digits as its factorization.

221646267352057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50803200, while the sum is 58.

The spelling of 221646267352057 in words is "two hundred twenty-one trillion, six hundred forty-six billion, two hundred sixty-seven million, three hundred fifty-two thousand, fifty-seven".