221856731810488 has 32 divisors (see below), whose sum is σ = 427065421487760. Its totient is φ = 108004573431040.

The previous prime is 221856731810471. The next prime is 221856731810507. The reversal of 221856731810488 is 884018137658122.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1997070445 + ... + 1997181532.

Almost surely, 2^{221856731810488} is an apocalyptic number.

It is an amenable number.

221856731810488 is a deficient number, since it is larger than the sum of its proper divisors (205208689677272).

221856731810488 is a wasteful number, since it uses less digits than its factorization.

221856731810488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3994252167 (or 3994252163 counting only the distinct ones).

The product of its (nonzero) digits is 41287680, while the sum is 64.

The spelling of 221856731810488 in words is "two hundred twenty-one trillion, eight hundred fifty-six billion, seven hundred thirty-one million, eight hundred ten thousand, four hundred eighty-eight".