221654163554220 has 48 divisors (see below), whose sum is σ = 621778851495648. Its totient is φ = 58998520419840.

The previous prime is 221654163554179. The next prime is 221654163554227. The reversal of 221654163554220 is 22455361456122.

It is a self number, because there is not a number n which added to its sum of digits gives 221654163554220.

It is not an unprimeable number, because it can be changed into a prime (221654163554227) 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 15 ways as a sum of consecutive naturals, for example, 3414233769 + ... + 3414298688.

It is an arithmetic number, because the mean of its divisors is an integer number (12953726072826).

Almost surely, 2^{221654163554220} is an apocalyptic number.

221654163554220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221654163554220 is an abundant number, since it is smaller than the sum of its proper divisors (400124687941428).

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

221654163554220 is a wasteful number, since it uses less digits than its factorization.

221654163554220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6828533010 (or 6828533008 counting only the distinct ones).

The product of its (nonzero) digits is 3456000, while the sum is 48.

The spelling of 221654163554220 in words is "two hundred twenty-one trillion, six hundred fifty-four billion, one hundred sixty-three million, five hundred fifty-four thousand, two hundred twenty".