21488673804 has 36 divisors (see below), whose sum is σ = 54293873256. Its totient is φ = 6611899008.

The previous prime is 21488673799. The next prime is 21488673809. The reversal of 21488673804 is 40837688412.

It is an interprime number because it is at equal distance from previous prime (21488673799) and next prime (21488673809).

It is not an unprimeable number, because it can be changed into a prime (21488673809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5295969 + ... + 5300024.

It is an arithmetic number, because the mean of its divisors is an integer number (1508163146).

Almost surely, 2^21488673804 is an apocalyptic number.

It is an amenable number.

21488673804 is an abundant number, since it is smaller than the sum of its proper divisors (32805199452).

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

21488673804 is a wasteful number, since it uses less digits than its factorization.

21488673804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10596026 (or 10596011 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 51.

The spelling of 21488673804 in words is "twenty-one billion, four hundred eighty-eight million, six hundred seventy-three thousand, eight hundred four".