221029036 has 12 divisors (see below), whose sum is σ = 409553928. Its totient is φ = 104013632.

The previous prime is 221029031. The next prime is 221029069. The reversal of 221029036 is 630920122.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 221029036.

It is not an unprimeable number, because it can be changed into a prime (221029031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1625146 + ... + 1625281.

It is an arithmetic number, because the mean of its divisors is an integer number (34129494).

Almost surely, 2^221029036 is an apocalyptic number.

It is an amenable number.

221029036 is a deficient number, since it is larger than the sum of its proper divisors (188524892).

221029036 is a wasteful number, since it uses less digits than its factorization.

221029036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3250448 (or 3250446 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 221029036 is about 14867.0453016058. The cubic root of 221029036 is about 604.6208365742.

Adding to 221029036 its reverse (630920122), we get a palindrome (851949158).

The spelling of 221029036 in words is "two hundred twenty-one million, twenty-nine thousand, thirty-six".