221005135 has 32 divisors (see below), whose sum is σ = 293106240. Its totient is φ = 158976000.

The previous prime is 221005121. The next prime is 221005153. The reversal of 221005135 is 531500122.

221005135 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221005135 - 2⁷ = 221005007 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 550935 + ... + 551335.

It is an arithmetic number, because the mean of its divisors is an integer number (9159570).

Almost surely, 2^221005135 is an apocalyptic number.

221005135 is a deficient number, since it is larger than the sum of its proper divisors (72101105).

221005135 is a wasteful number, since it uses less digits than its factorization.

221005135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 221005135 is about 14866.2414550551. The cubic root of 221005135 is about 604.5990422076.

Adding to 221005135 its reverse (531500122), we get a palindrome (752505257).

The spelling of 221005135 in words is "two hundred twenty-one million, five thousand, one hundred thirty-five".