221235530 has 16 divisors (see below), whose sum is σ = 411070464. Its totient is φ = 85639440.

The previous prime is 221235527. The next prime is 221235557. The reversal of 221235530 is 35532122.

It is a junction number, because it is equal to n+sod(n) for n = 221235496 and 221235505.

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, 356522 + ... + 357141.

It is an arithmetic number, because the mean of its divisors is an integer number (25691904).

Almost surely, 2^221235530 is an apocalyptic number.

221235530 is a deficient number, since it is larger than the sum of its proper divisors (189834934).

221235530 is a wasteful number, since it uses less digits than its factorization.

221235530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713701.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 221235530 is about 14873.9883689614. The cubic root of 221235530 is about 604.8090648078.

Adding to 221235530 its reverse (35532122), we get a palindrome (256767652).

The spelling of 221235530 in words is "two hundred twenty-one million, two hundred thirty-five thousand, five hundred thirty".