221723983 has 16 divisors (see below), whose sum is σ = 243432000. Its totient is φ = 200712960.

The previous prime is 221723969. The next prime is 221723989. The reversal of 221723983 is 389327122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221723983 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 (221723989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210843 + ... + 211891.

It is an arithmetic number, because the mean of its divisors is an integer number (15214500).

Almost surely, 2^221723983 is an apocalyptic number.

221723983 is a deficient number, since it is larger than the sum of its proper divisors (21708017).

221723983 is a wasteful number, since it uses less digits than its factorization.

221723983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1362.

The product of its digits is 36288, while the sum is 37.

The square root of 221723983 is about 14890.3990208456. The cubic root of 221723983 is about 605.2538451652.

The spelling of 221723983 in words is "two hundred twenty-one million, seven hundred twenty-three thousand, nine hundred eighty-three".