221642673556547 has 2 divisors, whose sum is σ = 221642673556548. Its totient is φ = 221642673556546.

The previous prime is 221642673556517. The next prime is 221642673556561. The reversal of 221642673556547 is 745655376246122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221642673556547 - 2⁶ = 221642673556483 is a prime.

It is not a weakly prime, because it can be changed into another prime (221642673556517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110821336778273 + 110821336778274.

It is an arithmetic number, because the mean of its divisors is an integer number (110821336778274).

Almost surely, 2^{221642673556547} is an apocalyptic number.

221642673556547 is a deficient number, since it is larger than the sum of its proper divisors (1).

221642673556547 is an equidigital number, since it uses as much as digits as its factorization.

221642673556547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032000, while the sum is 65.

The spelling of 221642673556547 in words is "two hundred twenty-one trillion, six hundred forty-two billion, six hundred seventy-three million, five hundred fifty-six thousand, five hundred forty-seven".