705220221 has 4 divisors (see below), whose sum is σ = 940293632. Its totient is φ = 470146812.

The previous prime is 705220199. The next prime is 705220249. The reversal of 705220221 is 122022507.

It is a happy number.

705220221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 705220221 - 2⁵ = 705220189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (705220121) 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, 117536701 + ... + 117536706.

It is an arithmetic number, because the mean of its divisors is an integer number (235073408).

Almost surely, 2^705220221 is an apocalyptic number.

It is an amenable number.

705220221 is a deficient number, since it is larger than the sum of its proper divisors (235073411).

705220221 is a wasteful number, since it uses less digits than its factorization.

705220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235073410.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 705220221 is about 26555.9827722493. The cubic root of 705220221 is about 890.1057068402.

Adding to 705220221 its reverse (122022507), we get a palindrome (827242728).

The spelling of 705220221 in words is "seven hundred five million, two hundred twenty thousand, two hundred twenty-one".