221513055457 has 2 divisors, whose sum is σ = 221513055458. Its totient is φ = 221513055456.

The previous prime is 221513055403. The next prime is 221513055493. The reversal of 221513055457 is 754550315122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189141489216 + 32371566241 = 434904^2 + 179921^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221513055457 is a prime.

It is not a weakly prime, because it can be changed into another prime (221513655457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110756527728 + 110756527729.

It is an arithmetic number, because the mean of its divisors is an integer number (110756527729).

Almost surely, 2^221513055457 is an apocalyptic number.

It is an amenable number.

221513055457 is a deficient number, since it is larger than the sum of its proper divisors (1).

221513055457 is an equidigital number, since it uses as much as digits as its factorization.

221513055457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 210000, while the sum is 40.

The spelling of 221513055457 in words is "two hundred twenty-one billion, five hundred thirteen million, fifty-five thousand, four hundred fifty-seven".