221443634 has 8 divisors (see below), whose sum is σ = 333169968. Its totient is φ = 110386980.

The previous prime is 221443627. The next prime is 221443661. The reversal of 221443634 is 436344122.

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

It is a junction number, because it is equal to n+sod(n) for n = 221443597 and 221443606.

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, 166592 + ... + 167915.

It is an arithmetic number, because the mean of its divisors is an integer number (41646246).

Almost surely, 2^221443634 is an apocalyptic number.

221443634 is a deficient number, since it is larger than the sum of its proper divisors (111726334).

221443634 is a wasteful number, since it uses less digits than its factorization.

221443634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334840.

The product of its digits is 13824, while the sum is 29.

The square root of 221443634 is about 14880.9822928461. The cubic root of 221443634 is about 604.9986421662.

Adding to 221443634 its reverse (436344122), we get a palindrome (657787756).

The spelling of 221443634 in words is "two hundred twenty-one million, four hundred forty-three thousand, six hundred thirty-four".