221623055 has 8 divisors (see below), whose sum is σ = 277510752. Its totient is φ = 169589728.

The previous prime is 221623043. The next prime is 221623063. The reversal of 221623055 is 550326122.

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 221623055 - 2¹⁶ = 221557519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 963464 + ... + 963693.

It is an arithmetic number, because the mean of its divisors is an integer number (34688844).

Almost surely, 2^221623055 is an apocalyptic number.

221623055 is a deficient number, since it is larger than the sum of its proper divisors (55887697).

221623055 is a wasteful number, since it uses less digits than its factorization.

221623055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1927185.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 221623055 is about 14887.0096056931. The cubic root of 221623055 is about 605.1619947326.

Adding to 221623055 its reverse (550326122), we get a palindrome (771949177).

The spelling of 221623055 in words is "two hundred twenty-one million, six hundred twenty-three thousand, fifty-five".