221500723 has 8 divisors (see below), whose sum is σ = 223712496. Its totient is φ = 219300000.

The previous prime is 221500709. The next prime is 221500729. The reversal of 221500723 is 327005122.

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 221500723 - 2¹⁷ = 221369651 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221500694 and 221500703.

It is not an unprimeable number, because it can be changed into a prime (221500729) 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, 40873 + ... + 45973.

It is an arithmetic number, because the mean of its divisors is an integer number (27964062).

Almost surely, 2^221500723 is an apocalyptic number.

221500723 is a deficient number, since it is larger than the sum of its proper divisors (2211773).

221500723 is a wasteful number, since it uses less digits than its factorization.

221500723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5525.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 221500723 is about 14882.9003557774. The cubic root of 221500723 is about 605.0506280060.

Adding to 221500723 its reverse (327005122), we get a palindrome (548505845).

The spelling of 221500723 in words is "two hundred twenty-one million, five hundred thousand, seven hundred twenty-three".