221458728643 has 2 divisors, whose sum is σ = 221458728644. Its totient is φ = 221458728642.

The previous prime is 221458728577. The next prime is 221458728661. The reversal of 221458728643 is 346827854122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221458728643 - 2⁹ = 221458728131 is a prime.

It is not a weakly prime, because it can be changed into another prime (221458738643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110729364321 + 110729364322.

It is an arithmetic number, because the mean of its divisors is an integer number (110729364322).

Almost surely, 2^221458728643 is an apocalyptic number.

221458728643 is a deficient number, since it is larger than the sum of its proper divisors (1).

221458728643 is an equidigital number, since it uses as much as digits as its factorization.

221458728643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5160960, while the sum is 52.

The spelling of 221458728643 in words is "two hundred twenty-one billion, four hundred fifty-eight million, seven hundred twenty-eight thousand, six hundred forty-three".