221709949193 has 8 divisors (see below), whose sum is σ = 228696451080. Its totient is φ = 214775781120.

The previous prime is 221709949171. The next prime is 221709949199. The reversal of 221709949193 is 391949907122.

It can be written as a sum of positive squares in 4 ways, for example, as 109479589129 + 112230360064 = 330877^2 + 335008^2 .

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 221709949193 - 2²⁸ = 221441513737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221709949199) 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, 13074848 + ... + 13091793.

It is an arithmetic number, because the mean of its divisors is an integer number (28587056385).

Almost surely, 2^221709949193 is an apocalyptic number.

It is an amenable number.

221709949193 is a deficient number, since it is larger than the sum of its proper divisors (6986501887).

221709949193 is a wasteful number, since it uses less digits than its factorization.

221709949193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26166907.

The product of its (nonzero) digits is 2204496, while the sum is 56.

The spelling of 221709949193 in words is "two hundred twenty-one billion, seven hundred nine million, nine hundred forty-nine thousand, one hundred ninety-three".