221416447 has 8 divisors (see below), whose sum is σ = 258212000. Its totient is φ = 189785232.

The previous prime is 221416427. The next prime is 221416451. The reversal of 221416447 is 744614122.

It is a de Polignac number, because none of the positive numbers 2^k-221416447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221416427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322422 + ... + 323107.

It is an arithmetic number, because the mean of its divisors is an integer number (32276500).

Almost surely, 2^221416447 is an apocalyptic number.

221416447 is a deficient number, since it is larger than the sum of its proper divisors (36795553).

221416447 is an frugal number, since it uses more digits than its factorization.

221416447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645550 (or 645536 counting only the distinct ones).

The product of its digits is 10752, while the sum is 31.

The square root of 221416447 is about 14880.0687834432. The cubic root of 221416447 is about 604.9738822594.

The spelling of 221416447 in words is "two hundred twenty-one million, four hundred sixteen thousand, four hundred forty-seven".