221425043054556 has 96 divisors (see below), whose sum is σ = 569870521032960. Its totient is φ = 66356813952000.

The previous prime is 221425043054521. The next prime is 221425043054581. The reversal of 221425043054556 is 655450340524122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1784820 + ... + 21119556.

It is an arithmetic number, because the mean of its divisors is an integer number (5936151260760).

Almost surely, 2^{221425043054556} 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 221425043054556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284935260516480).

221425043054556 is an abundant number, since it is smaller than the sum of its proper divisors (348445477978404).

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

221425043054556 is a wasteful number, since it uses less digits than its factorization.

221425043054556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19335715 (or 19335713 counting only the distinct ones).

The product of its (nonzero) digits is 5760000, while the sum is 48.

Adding to 221425043054556 its reverse (655450340524122), we get a palindrome (876875383578678).

The spelling of 221425043054556 in words is "two hundred twenty-one trillion, four hundred twenty-five billion, forty-three million, fifty-four thousand, five hundred fifty-six".