21017882748 has 48 divisors (see below), whose sum is σ = 52143920640. Its totient is φ = 6566241024.

The previous prime is 21017882737. The next prime is 21017882779. The reversal of 21017882748 is 84728871012.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21017882697 and 21017882706.

It is a congruent number.

It is an unprimeable number.

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, 166786 + ... + 264297.

It is an arithmetic number, because the mean of its divisors is an integer number (1086331680).

Almost surely, 2^21017882748 is an apocalyptic number.

It is an amenable number.

21017882748 is an abundant number, since it is smaller than the sum of its proper divisors (31126037892).

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

21017882748 is a wasteful number, since it uses less digits than its factorization.

21017882748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431346 (or 431344 counting only the distinct ones).

The product of its (nonzero) digits is 401408, while the sum is 48.

The spelling of 21017882748 in words is "twenty-one billion, seventeen million, eight hundred eighty-two thousand, seven hundred forty-eight".