221407345744447 has 2 divisors, whose sum is σ = 221407345744448. Its totient is φ = 221407345744446.

The previous prime is 221407345744337. The next prime is 221407345744451. The reversal of 221407345744447 is 744447543704122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221407345744447 - 2¹¹ = 221407345742399 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221407345744391 and 221407345744400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221407345754447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110703672872223 + 110703672872224.

It is an arithmetic number, because the mean of its divisors is an integer number (110703672872224).

Almost surely, 2^{221407345744447} is an apocalyptic number.

221407345744447 is a deficient number, since it is larger than the sum of its proper divisors (1).

221407345744447 is an equidigital number, since it uses as much as digits as its factorization.

221407345744447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84295680, while the sum is 58.

The spelling of 221407345744447 in words is "two hundred twenty-one trillion, four hundred seven billion, three hundred forty-five million, seven hundred forty-four thousand, four hundred forty-seven".