221534403655068 has 72 divisors (see below), whose sum is σ = 642735008199648. Its totient is φ = 63023889189888.

The previous prime is 221534403655067. The next prime is 221534403655129. The reversal of 221534403655068 is 860556304435122.

221534403655068 is a `hidden beast` number, since 2 + 2 + 1 + 5 + 34 + 40 + 3 + 65 + 506 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221534403655067) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1886432221 + ... + 1886549652.

It is an arithmetic number, because the mean of its divisors is an integer number (8926875113884).

Almost surely, 2^{221534403655068} is an apocalyptic number.

221534403655068 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

221534403655068 is an abundant number, since it is smaller than the sum of its proper divisors (421200604544580).

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

221534403655068 is a wasteful number, since it uses less digits than its factorization.

221534403655068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3772982123 (or 3772982118 counting only the distinct ones).

The product of its (nonzero) digits is 20736000, while the sum is 54.

The spelling of 221534403655068 in words is "two hundred twenty-one trillion, five hundred thirty-four billion, four hundred three million, six hundred fifty-five thousand, sixty-eight".