221034406 has 4 divisors (see below), whose sum is σ = 331551612. Its totient is φ = 110517202.

The previous prime is 221034397. The next prime is 221034419. The reversal of 221034406 is 604430122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55258600 + ... + 55258603.

It is an arithmetic number, because the mean of its divisors is an integer number (82887903).

Almost surely, 2^221034406 is an apocalyptic number.

221034406 is a deficient number, since it is larger than the sum of its proper divisors (110517206).

221034406 is a wasteful number, since it uses less digits than its factorization.

221034406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110517205.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 221034406 is about 14867.2259012904. The cubic root of 221034406 is about 604.6257330464.

Adding to 221034406 its reverse (604430122), we get a palindrome (825464528).

The spelling of 221034406 in words is "two hundred twenty-one million, thirty-four thousand, four hundred six".