221813790979 has 16 divisors (see below), whose sum is σ = 245056420224. Its totient is φ = 199087340800.

The previous prime is 221813790973. The next prime is 221813790997. The reversal of 221813790979 is 979097318122.

It is a cyclic number.

It is not a de Polignac number, because 221813790979 - 2²⁷ = 221679573251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221813790973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1310739 + ... + 1470259.

It is an arithmetic number, because the mean of its divisors is an integer number (15316026264).

Almost surely, 2^221813790979 is an apocalyptic number.

221813790979 is a deficient number, since it is larger than the sum of its proper divisors (23242629245).

221813790979 is a wasteful number, since it uses less digits than its factorization.

221813790979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161138.

The product of its (nonzero) digits is 3429216, while the sum is 58.

The spelling of 221813790979 in words is "two hundred twenty-one billion, eight hundred thirteen million, seven hundred ninety thousand, nine hundred seventy-nine".