21004282880 has 88 divisors (see below), whose sum is σ = 57583714848. Its totient is φ = 7201456128.

The previous prime is 21004282879. The next prime is 21004282889. The reversal of 21004282880 is 8828240012.

It is a super-2 number, since 2×21004282880² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 21004282880.

It is not an unprimeable number, because it can be changed into a prime (21004282889) 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 7 ways as a sum of consecutive naturals, for example, 257189 + ... + 328868.

It is an arithmetic number, because the mean of its divisors is an integer number (654360396).

Almost surely, 2^21004282880 is an apocalyptic number.

21004282880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21004282880 is an abundant number, since it is smaller than the sum of its proper divisors (36579431968).

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

21004282880 is an equidigital number, since it uses as much as digits as its factorization.

21004282880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586089 (or 586071 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 35.

The spelling of 21004282880 in words is "twenty-one billion, four million, two hundred eighty-two thousand, eight hundred eighty".