221534403655173 has 48 divisors (see below), whose sum is σ = 344943295272576. Its totient is φ = 126097894231680.

The previous prime is 221534403655153. The next prime is 221534403655183. The reversal of 221534403655173 is 371556304435122.

It is not a de Polignac number, because 221534403655173 - 2⁵ = 221534403655141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221534403655153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 419323843 + ... + 419851823.

It is an arithmetic number, because the mean of its divisors is an integer number (7186318651512).

Almost surely, 2^{221534403655173} is an apocalyptic number.

It is an amenable number.

221534403655173 is a deficient number, since it is larger than the sum of its proper divisors (123408891617403).

221534403655173 is a wasteful number, since it uses less digits than its factorization.

221534403655173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539114 (or 539107 counting only the distinct ones).

The product of its (nonzero) digits is 9072000, while the sum is 51.

The spelling of 221534403655173 in words is "two hundred twenty-one trillion, five hundred thirty-four billion, four hundred three million, six hundred fifty-five thousand, one hundred seventy-three".