221739393937 has 8 divisors (see below), whose sum is σ = 234889501536. Its totient is φ = 208601132352.

The previous prime is 221739393917. The next prime is 221739393947. The reversal of 221739393937 is 739393937122.

It is a happy number.

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 221739393937 - 2²⁷ = 221605176209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221739393917) 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 7 ways as a sum of consecutive naturals, for example, 2922943 + ... + 2997844.

It is an arithmetic number, because the mean of its divisors is an integer number (29361187692).

Almost surely, 2^221739393937 is an apocalyptic number.

It is an amenable number.

221739393937 is a deficient number, since it is larger than the sum of its proper divisors (13150107599).

221739393937 is a wasteful number, since it uses less digits than its factorization.

221739393937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5923007.

The product of its digits is 11573604, while the sum is 58.

The spelling of 221739393937 in words is "two hundred twenty-one billion, seven hundred thirty-nine million, three hundred ninety-three thousand, nine hundred thirty-seven".