2005505221 has 2 divisors, whose sum is σ = 2005505222. Its totient is φ = 2005505220.

The previous prime is 2005505197. The next prime is 2005505239. The reversal of 2005505221 is 1225055002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1984702500 + 20802721 = 44550^2 + 4561^2 .

It is a cyclic number.

It is not a de Polignac number, because 2005505221 - 2⁷ = 2005505093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2005505192 and 2005505201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2005505261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1002752610 + 1002752611.

It is an arithmetic number, because the mean of its divisors is an integer number (1002752611).

Almost surely, 2^2005505221 is an apocalyptic number.

It is an amenable number.

2005505221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2005505221 is an equidigital number, since it uses as much as digits as its factorization.

2005505221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 2005505221 is about 44782.8674941657. The cubic root of 2005505221 is about 1261.0760147897.

The spelling of 2005505221 in words is "two billion, five million, five hundred five thousand, two hundred twenty-one".