21498764384 has 12 divisors (see below), whose sum is σ = 42325692444. Its totient is φ = 10749382176.

The previous prime is 21498764381. The next prime is 21498764407. The reversal of 21498764384 is 48346789412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21498764381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335918162 + ... + 335918225.

It is an arithmetic number, because the mean of its divisors is an integer number (3527141037).

Almost surely, 2^21498764384 is an apocalyptic number.

It is an amenable number.

21498764384 is a deficient number, since it is larger than the sum of its proper divisors (20826928060).

21498764384 is an equidigital number, since it uses as much as digits as its factorization.

21498764384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671836397 (or 671836389 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 56.

The spelling of 21498764384 in words is "twenty-one billion, four hundred ninety-eight million, seven hundred sixty-four thousand, three hundred eighty-four".