18802447884421 has 4 divisors (see below), whose sum is σ = 18803590837344. Its totient is φ = 18801304931500.

The previous prime is 18802447884391. The next prime is 18802447884449. The reversal of 18802447884421 is 12448874420881.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18802447884421 - 2⁷ = 18802447884293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18802447884421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18802447884721) 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 3 ways as a sum of consecutive naturals, for example, 571451785 + ... + 571484686.

It is an arithmetic number, because the mean of its divisors is an integer number (4700897709336).

Almost surely, 2^{18802447884421} is an apocalyptic number.

It is an amenable number.

18802447884421 is a deficient number, since it is larger than the sum of its proper divisors (1142952923).

18802447884421 is a wasteful number, since it uses less digits than its factorization.

18802447884421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142952922.

The product of its (nonzero) digits is 29360128, while the sum is 61.

The spelling of 18802447884421 in words is "eighteen trillion, eight hundred two billion, four hundred forty-seven million, eight hundred eighty-four thousand, four hundred twenty-one".