221440134432 has 96 divisors (see below), whose sum is σ = 646088788800. Its totient is φ = 65836958720.

The previous prime is 221440134431. The next prime is 221440134457. The reversal of 221440134432 is 234431044122.

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 221440134432.

It is not an unprimeable number, because it can be changed into a prime (221440134431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1922307 + ... + 2034242.

It is an arithmetic number, because the mean of its divisors is an integer number (6730091550).

Almost surely, 2^221440134432 is an apocalyptic number.

221440134432 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221440134432 is an abundant number, since it is smaller than the sum of its proper divisors (424648654368).

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

221440134432 is a wasteful number, since it uses less digits than its factorization.

221440134432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3956626 (or 3956618 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 221440134432 its reverse (234431044122), we get a palindrome (455871178554).

The spelling of 221440134432 in words is "two hundred twenty-one billion, four hundred forty million, one hundred thirty-four thousand, four hundred thirty-two".