221342236 has 12 divisors (see below), whose sum is σ = 387577960. Its totient is φ = 110605680.

The previous prime is 221342203. The next prime is 221342299. The reversal of 221342236 is 632243122.

It is a self number, because there is not a number n which added to its sum of digits gives 221342236.

It is a congruent number.

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, 8310 + ... + 22621.

Almost surely, 2^221342236 is an apocalyptic number.

It is an amenable number.

221342236 is a deficient number, since it is larger than the sum of its proper divisors (166235724).

221342236 is a wasteful number, since it uses less digits than its factorization.

221342236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32724 (or 32722 counting only the distinct ones).

The product of its digits is 3456, while the sum is 25.

The square root of 221342236 is about 14877.5749367967. The cubic root of 221342236 is about 604.9062860560.

Adding to 221342236 its reverse (632243122), we get a palindrome (853585358).

The spelling of 221342236 in words is "two hundred twenty-one million, three hundred forty-two thousand, two hundred thirty-six".