221365055 has 4 divisors (see below), whose sum is σ = 265638072. Its totient is φ = 177092040.

The previous prime is 221365051. The next prime is 221365057. The reversal of 221365055 is 550563122.

It is a happy number.

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

It is not a de Polignac number, because 221365055 - 2² = 221365051 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 (221365051) 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, 22136501 + ... + 22136510.

It is an arithmetic number, because the mean of its divisors is an integer number (66409518).

Almost surely, 2^221365055 is an apocalyptic number.

221365055 is a deficient number, since it is larger than the sum of its proper divisors (44273017).

221365055 is an equidigital number, since it uses as much as digits as its factorization.

221365055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44273016.

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 221365055 is about 14878.3418094894. The cubic root of 221365055 is about 604.9270726931.

The spelling of 221365055 in words is "two hundred twenty-one million, three hundred sixty-five thousand, fifty-five".