221019420527444 has 96 divisors (see below), whose sum is σ = 488047569601536. Its totient is φ = 85071630574080.

The previous prime is 221019420527443. The next prime is 221019420527561. The reversal of 221019420527444 is 444725024910122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221019420527443) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1141514747 + ... + 1141708349.

It is an arithmetic number, because the mean of its divisors is an integer number (5083828850016).

Almost surely, 2^{221019420527444} 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 221019420527444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244023784800768).

221019420527444 is an abundant number, since it is smaller than the sum of its proper divisors (267028149074092).

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

221019420527444 is a wasteful number, since it uses less digits than its factorization.

221019420527444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238365 (or 238363 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 47.

The spelling of 221019420527444 in words is "two hundred twenty-one trillion, nineteen billion, four hundred twenty million, five hundred twenty-seven thousand, four hundred forty-four".