221743865867880 has 128 divisors (see below), whose sum is σ = 703798325366400. Its totient is φ = 55735139884032.

The previous prime is 221743865867833. The next prime is 221743865867891. The reversal of 221743865867880 is 88768568347122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 246393687 + ... + 247292006.

It is an arithmetic number, because the mean of its divisors is an integer number (5498424416925).

Almost surely, 2^{221743865867880} is an apocalyptic number.

221743865867880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221743865867880 is an abundant number, since it is smaller than the sum of its proper divisors (482054459498520).

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

221743865867880 is a wasteful number, since it uses less digits than its factorization.

221743865867880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493685923 (or 493685919 counting only the distinct ones).

The product of its (nonzero) digits is 1734082560, while the sum is 75.

The spelling of 221743865867880 in words is "two hundred twenty-one trillion, seven hundred forty-three billion, eight hundred sixty-five million, eight hundred sixty-seven thousand, eight hundred eighty".