221785992079 has 2 divisors, whose sum is σ = 221785992080. Its totient is φ = 221785992078.

The previous prime is 221785992061. The next prime is 221785992089. The reversal of 221785992079 is 970299587122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221785992079 - 2⁵ = 221785992047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221785992089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110892996039 + 110892996040.

It is an arithmetic number, because the mean of its divisors is an integer number (110892996040).

Almost surely, 2^221785992079 is an apocalyptic number.

221785992079 is a deficient number, since it is larger than the sum of its proper divisors (1).

221785992079 is an equidigital number, since it uses as much as digits as its factorization.

221785992079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11430720, while the sum is 61.

The spelling of 221785992079 in words is "two hundred twenty-one billion, seven hundred eighty-five million, nine hundred ninety-two thousand, seventy-nine".