221345540442400 has 288 divisors, whose sum is σ = 595449588787200. Its totient is φ = 79677480960000.

The previous prime is 221345540442353. The next prime is 221345540442401. The reversal of 221345540442400 is 4244045543122.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (221345540442401) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 501581850 + ... + 502022950.

It is an arithmetic number, because the mean of its divisors is an integer number (2067533294400).

Almost surely, 2^{221345540442400} is an apocalyptic number.

221345540442400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221345540442400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (297724794393600).

221345540442400 is an abundant number, since it is smaller than the sum of its proper divisors (374104048344800).

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

221345540442400 is a wasteful number, since it uses less digits than its factorization.

221345540442400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441708 (or 441695 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 40.

Adding to 221345540442400 its reverse (4244045543122), we get a palindrome (225589585985522).

The spelling of 221345540442400 in words is "two hundred twenty-one trillion, three hundred forty-five billion, five hundred forty million, four hundred forty-two thousand, four hundred".