221340412 has 24 divisors (see below), whose sum is σ = 401556960. Its totient is φ = 106626240.

The previous prime is 221340409. The next prime is 221340439. The reversal of 221340412 is 214043122.

221340412 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 221340412.

It is a congruent number.

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, 60993 + ... + 64519.

It is an arithmetic number, because the mean of its divisors is an integer number (16731540).

Almost surely, 2^221340412 is an apocalyptic number.

It is an amenable number.

221340412 is a deficient number, since it is larger than the sum of its proper divisors (180216548).

221340412 is a wasteful number, since it uses less digits than its factorization.

221340412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4101 (or 4099 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 221340412 is about 14877.5136363574. The cubic root of 221340412 is about 604.9046244480.

Adding to 221340412 its reverse (214043122), we get a palindrome (435383534).

The spelling of 221340412 in words is "two hundred twenty-one million, three hundred forty thousand, four hundred twelve".