221791791959 has 8 divisors (see below), whose sum is σ = 226520260608. Its totient is φ = 217063719000.

The previous prime is 221791791931. The next prime is 221791791979. The reversal of 221791791959 is 959197197122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221791791959 - 2¹² = 221791787863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221791791979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1219274 + ... + 1389320.

It is an arithmetic number, because the mean of its divisors is an integer number (28315032576).

Almost surely, 2^221791791959 is an apocalyptic number.

221791791959 is a deficient number, since it is larger than the sum of its proper divisors (4728468649).

221791791959 is a wasteful number, since it uses less digits than its factorization.

221791791959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197845.

The product of its digits is 6429780, while the sum is 62.

The spelling of 221791791959 in words is "two hundred twenty-one billion, seven hundred ninety-one million, seven hundred ninety-one thousand, nine hundred fifty-nine".