221630366 has 8 divisors (see below), whose sum is σ = 332610960. Its totient is φ = 110760048.

The previous prime is 221630359. The next prime is 221630371. The reversal of 221630366 is 663036122.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22346 + ... + 30701.

It is an arithmetic number, because the mean of its divisors is an integer number (41576370).

Almost surely, 2^221630366 is an apocalyptic number.

221630366 is a deficient number, since it is larger than the sum of its proper divisors (110980594).

221630366 is a wasteful number, since it uses less digits than its factorization.

221630366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55138.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 221630366 is about 14887.2551533182. The cubic root of 221630366 is about 605.1686491105.

Adding to 221630366 its reverse (663036122), we get a palindrome (884666488).

The spelling of 221630366 in words is "two hundred twenty-one million, six hundred thirty thousand, three hundred sixty-six".