221555045 has 8 divisors (see below), whose sum is σ = 267403896. Its totient is φ = 176218816.

The previous prime is 221555017. The next prime is 221555051. The reversal of 221555045 is 540555122.

221555045 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 35259844 + 186295201 = 5938^2 + 13649^2 .

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 221555045 - 2¹⁸ = 221292901 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221554999 and 221555017.

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, 127202 + ... + 128931.

It is an arithmetic number, because the mean of its divisors is an integer number (33425487).

Almost surely, 2^221555045 is an apocalyptic number.

It is an amenable number.

221555045 is a deficient number, since it is larger than the sum of its proper divisors (45848851).

221555045 is a wasteful number, since it uses less digits than its factorization.

221555045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256311.

The product of its (nonzero) digits is 10000, while the sum is 29.

The square root of 221555045 is about 14884.7252242022. The cubic root of 221555045 is about 605.1000858938.

The spelling of 221555045 in words is "two hundred twenty-one million, five hundred fifty-five thousand, forty-five".