221535201566364 has 96 divisors (see below), whose sum is σ = 609331019222016. Its totient is φ = 61320761510400.

The previous prime is 221535201566363. The next prime is 221535201566443. The reversal of 221535201566364 is 463665102535122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221535201566363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 152235112 + ... + 153683439.

It is an arithmetic number, because the mean of its divisors is an integer number (6347198116896).

Almost surely, 2^{221535201566364} is an apocalyptic number.

It is an amenable number.

221535201566364 is an abundant number, since it is smaller than the sum of its proper divisors (387795817655652).

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

221535201566364 is a wasteful number, since it uses less digits than its factorization.

221535201566364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305918835 (or 305918833 counting only the distinct ones).

The product of its (nonzero) digits is 7776000, while the sum is 51.

The spelling of 221535201566364 in words is "two hundred twenty-one trillion, five hundred thirty-five billion, two hundred one million, five hundred sixty-six thousand, three hundred sixty-four".