221307055 has 8 divisors (see below), whose sum is σ = 266144832. Its totient is φ = 176661408.

The previous prime is 221307049. The next prime is 221307061. The reversal of 221307055 is 550703122.

221307055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (221307049) and next prime (221307061).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221307055 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, 45484 + ... + 50113.

It is an arithmetic number, because the mean of its divisors is an integer number (33268104).

Almost surely, 2^221307055 is an apocalyptic number.

221307055 is a deficient number, since it is larger than the sum of its proper divisors (44837777).

221307055 is an equidigital number, since it uses as much as digits as its factorization.

221307055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96065.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 221307055 is about 14876.3925398599. The cubic root of 221307055 is about 604.8742356348.

The spelling of 221307055 in words is "two hundred twenty-one million, three hundred seven thousand, fifty-five".