221863738 has 8 divisors (see below), whose sum is σ = 335190240. Its totient is φ = 110133660.

The previous prime is 221863721. The next prime is 221863769. The reversal of 221863738 is 837368122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 221863738.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398758 + ... + 399313.

It is an arithmetic number, because the mean of its divisors is an integer number (41898780).

Almost surely, 2^221863738 is an apocalyptic number.

221863738 is a deficient number, since it is larger than the sum of its proper divisors (113326502).

221863738 is a wasteful number, since it uses less digits than its factorization.

221863738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798212.

The product of its digits is 96768, while the sum is 40.

The square root of 221863738 is about 14895.0910705507. The cubic root of 221863738 is about 605.3809844491.

It can be divided in two parts, 2218 and 63738, that added together give a palindrome (65956).

The spelling of 221863738 in words is "two hundred twenty-one million, eight hundred sixty-three thousand, seven hundred thirty-eight".