221501321440018 has 8 divisors (see below), whose sum is σ = 332252096647680. Its totient is φ = 110750622557460.

The previous prime is 221501321439949. The next prime is 221501321440019. The reversal of 221501321440018 is 810044123105122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (221501321440019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11170078 + ... + 23827993.

It is an arithmetic number, because the mean of its divisors is an integer number (41531512080960).

Almost surely, 2^{221501321440018} is an apocalyptic number.

221501321440018 is a deficient number, since it is larger than the sum of its proper divisors (110750775207662).

221501321440018 is a wasteful number, since it uses less digits than its factorization.

221501321440018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38162552.

The product of its (nonzero) digits is 15360, while the sum is 34.

The spelling of 221501321440018 in words is "two hundred twenty-one trillion, five hundred one billion, three hundred twenty-one million, four hundred forty thousand, eighteen".