221551223 has 4 divisors (see below), whose sum is σ = 221603640. Its totient is φ = 221498808.

The previous prime is 221551189. The next prime is 221551241. The reversal of 221551223 is 322155122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221551223 - 2⁶ = 221551159 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 (221551243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19253 + ... + 28526.

It is an arithmetic number, because the mean of its divisors is an integer number (55400910).

Almost surely, 2^221551223 is an apocalyptic number.

221551223 is a deficient number, since it is larger than the sum of its proper divisors (52417).

221551223 is an equidigital number, since it uses as much as digits as its factorization.

221551223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52416.

The product of its digits is 1200, while the sum is 23.

The square root of 221551223 is about 14884.5968369990. The cubic root of 221551223 is about 605.0966063885.

The spelling of 221551223 in words is "two hundred twenty-one million, five hundred fifty-one thousand, two hundred twenty-three".