221240770 has 8 divisors (see below), whose sum is σ = 398233404. Its totient is φ = 88496304.

The previous prime is 221240741. The next prime is 221240777. The reversal of 221240770 is 77042122.

It can be written as a sum of positive squares in 2 ways, for example, as 216943441 + 4297329 = 14729^2 + 2073^2 .

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

It is a super-3 number, since 3×221240770³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (221240777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11062029 + ... + 11062048.

Almost surely, 2^221240770 is an apocalyptic number.

221240770 is a deficient number, since it is larger than the sum of its proper divisors (176992634).

221240770 is a wasteful number, since it uses less digits than its factorization.

221240770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22124084.

The product of its (nonzero) digits is 1568, while the sum is 25.

The square root of 221240770 is about 14874.1645143517. The cubic root of 221240770 is about 604.8138397709.

Adding to 221240770 its reverse (77042122), we get a palindrome (298282892).

The spelling of 221240770 in words is "two hundred twenty-one million, two hundred forty thousand, seven hundred seventy".