221719793 has 8 divisors (see below), whose sum is σ = 232895616. Its totient is φ = 210672000.

The previous prime is 221719789. The next prime is 221719837. The reversal of 221719793 is 397917122.

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

It is a cyclic number.

It is not a de Polignac number, because 221719793 - 2² = 221719789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221719793.

It is not an unprimeable number, because it can be changed into a prime (221710793) 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, 28448 + ... + 35393.

It is an arithmetic number, because the mean of its divisors is an integer number (29111952).

Almost surely, 2^221719793 is an apocalyptic number.

221719793 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

221719793 is a deficient number, since it is larger than the sum of its proper divisors (11175823).

221719793 is a wasteful number, since it uses less digits than its factorization.

221719793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64015.

The product of its digits is 47628, while the sum is 41.

The square root of 221719793 is about 14890.2583254959. The cubic root of 221719793 is about 605.2500325727.

The spelling of 221719793 in words is "two hundred twenty-one million, seven hundred nineteen thousand, seven hundred ninety-three".