221397449408 has 28 divisors (see below), whose sum is σ = 439430373360. Its totient is φ = 110674835712.

The previous prime is 221397449353. The next prime is 221397449419. The reversal of 221397449408 is 804944793122.

It is a self number, because there is not a number n which added to its sum of digits gives 221397449408.

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, 72503 + ... + 669366.

Almost surely, 2^221397449408 is an apocalyptic number.

It is an amenable number.

221397449408 is a deficient number, since it is larger than the sum of its proper divisors (218032923952).

221397449408 is an equidigital number, since it uses as much as digits as its factorization.

221397449408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746544 (or 746534 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 53.

The spelling of 221397449408 in words is "two hundred twenty-one billion, three hundred ninety-seven million, four hundred forty-nine thousand, four hundred eight".