221023455 has 8 divisors (see below), whose sum is σ = 353637552. Its totient is φ = 117879168.

The previous prime is 221023427. The next prime is 221023457. The reversal of 221023455 is 554320122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221023455 - 2⁵ = 221023423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221023457) 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, 7367434 + ... + 7367463.

It is an arithmetic number, because the mean of its divisors is an integer number (44204694).

Almost surely, 2^221023455 is an apocalyptic number.

221023455 is a deficient number, since it is larger than the sum of its proper divisors (132614097).

221023455 is a wasteful number, since it uses less digits than its factorization.

221023455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14734905.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 221023455 is about 14866.8576034077. The cubic root of 221023455 is about 604.6157476240.

Adding to 221023455 its reverse (554320122), we get a palindrome (775343577).

The spelling of 221023455 in words is "two hundred twenty-one million, twenty-three thousand, four hundred fifty-five".