221003453448 has 108 divisors (see below), whose sum is σ = 636026173965. Its totient is φ = 69313142016.

The previous prime is 221003453441. The next prime is 221003453449. The reversal of 221003453448 is 844354300122.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 202267866564 + 18735586884 = 449742^2 + 136878^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=332418.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (221003453441) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 67811643 + ... + 67814901.

Almost surely, 2^221003453448 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221003453448

221003453448 is an abundant number, since it is smaller than the sum of its proper divisors (415022720517).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221003453448 is an equidigital number, since it uses as much as digits as its factorization.

221003453448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6564 (or 3281 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

The spelling of 221003453448 in words is "two hundred twenty-one billion, three million, four hundred fifty-three thousand, four hundred forty-eight".