221715378445852 has 72 divisors (see below), whose sum is σ = 400151289605760. Its totient is φ = 107433231017280.

The previous prime is 221715378445741. The next prime is 221715378445879. The reversal of 221715378445852 is 258544873517122.

It is a happy number.

221715378445852 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2527520049 + ... + 2527607767.

It is an arithmetic number, because the mean of its divisors is an integer number (5557656800080).

Almost surely, 2^{221715378445852} is an apocalyptic number.

It is an amenable number.

221715378445852 is a deficient number, since it is larger than the sum of its proper divisors (178435911159908).

221715378445852 is a wasteful number, since it uses less digits than its factorization.

221715378445852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88603 (or 88428 counting only the distinct ones).

The product of its digits is 150528000, while the sum is 64.

The spelling of 221715378445852 in words is "two hundred twenty-one trillion, seven hundred fifteen billion, three hundred seventy-eight million, four hundred forty-five thousand, eight hundred fifty-two".