221221019992 has 64 divisors (see below), whose sum is σ = 502052152320. Its totient is φ = 89210300928.

The previous prime is 221221019909. The next prime is 221221019993. The reversal of 221221019992 is 299910122122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221221019993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4222743 + ... + 4274809.

It is an arithmetic number, because the mean of its divisors is an integer number (7844564880).

Almost surely, 2^221221019992 is an apocalyptic number.

It is an amenable number.

221221019992 is an abundant number, since it is smaller than the sum of its proper divisors (280831132328).

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

221221019992 is a wasteful number, since it uses less digits than its factorization.

221221019992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56560 (or 56556 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The spelling of 221221019992 in words is "two hundred twenty-one billion, two hundred twenty-one million, nineteen thousand, nine hundred ninety-two".