221561323 has 8 divisors (see below), whose sum is σ = 244794528. Its totient is φ = 199461504.

The previous prime is 221561321. The next prime is 221561381. The reversal of 221561323 is 323165122.

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 221561323 - 2¹ = 221561321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221561321) 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, 282936 + ... + 283717.

It is an arithmetic number, because the mean of its divisors is an integer number (30599316).

Almost surely, 2^221561323 is an apocalyptic number.

221561323 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

221561323 is a deficient number, since it is larger than the sum of its proper divisors (23233205).

221561323 is a wasteful number, since it uses less digits than its factorization.

221561323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566693.

The product of its digits is 2160, while the sum is 25.

The square root of 221561323 is about 14884.9361100409. The cubic root of 221561323 is about 605.1058012266.

The spelling of 221561323 in words is "two hundred twenty-one million, five hundred sixty-one thousand, three hundred twenty-three".