221025836 has 12 divisors (see below), whose sum is σ = 389112528. Its totient is φ = 109850832.

The previous prime is 221025829. The next prime is 221025887. The reversal of 221025836 is 638520122.

It is a junction number, because it is equal to n+sod(n) for n = 221025799 and 221025808.

It is an unprimeable number.

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, 164771 + ... + 166106.

It is an arithmetic number, because the mean of its divisors is an integer number (32426044).

Almost surely, 2^221025836 is an apocalyptic number.

It is an amenable number.

221025836 is a deficient number, since it is larger than the sum of its proper divisors (168086692).

221025836 is a wasteful number, since it uses less digits than its factorization.

221025836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331048 (or 331046 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 221025836 is about 14866.9376806389. The cubic root of 221025836 is about 604.6179187132.

Adding to 221025836 its reverse (638520122), we get a palindrome (859545958).

The spelling of 221025836 in words is "two hundred twenty-one million, twenty-five thousand, eight hundred thirty-six".