21081000048 has 80 divisors (see below), whose sum is σ = 54968481792. Its totient is φ = 6961600000.

The previous prime is 21081000043. The next prime is 21081000049. The reversal of 21081000048 is 84000018012.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 21080999991 and 21081000027.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21081000043) 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 in 15 ways as a sum of consecutive naturals, for example, 2296588 + ... + 2305748.

Almost surely, 2^21081000048 is an apocalyptic number.

It is an amenable number.

21081000048 is an abundant number, since it is smaller than the sum of its proper divisors (33887481744).

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

21081000048 is a wasteful number, since it uses less digits than its factorization.

21081000048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9614 (or 9608 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The spelling of 21081000048 in words is "twenty-one billion, eighty-one million, forty-eight", and thus it is an aban number and an uban number.