221530550723 has 8 divisors (see below), whose sum is σ = 225292700160. Its totient is φ = 217768647880.

The previous prime is 221530550701. The next prime is 221530550729. The reversal of 221530550723 is 327055035122.

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 221530550723 - 2²⁰ = 221529502147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221530550729) 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, 3218438 + ... + 3286548.

It is an arithmetic number, because the mean of its divisors is an integer number (28161587520).

Almost surely, 2^221530550723 is an apocalyptic number.

221530550723 is a deficient number, since it is larger than the sum of its proper divisors (3762149437).

221530550723 is an equidigital number, since it uses as much as digits as its factorization.

221530550723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123297.

The product of its (nonzero) digits is 63000, while the sum is 35.

Adding to 221530550723 its reverse (327055035122), we get a palindrome (548585585845).

The spelling of 221530550723 in words is "two hundred twenty-one billion, five hundred thirty million, five hundred fifty thousand, seven hundred twenty-three".