21184503480 has 640 divisors, whose sum is σ = 86980608000. Its totient is φ = 4520033280.

The previous prime is 21184503433. The next prime is 21184503491. The reversal of 21184503480 is 8430548112.

It is a super-2 number, since 2×21184503480² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 20388801 + ... + 20389839.

It is an arithmetic number, because the mean of its divisors is an integer number (135907200).

Almost surely, 2^21184503480 is an apocalyptic number.

21184503480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21184503480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43490304000).

21184503480 is an abundant number, since it is smaller than the sum of its proper divisors (65796104520).

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

21184503480 is a wasteful number, since it uses less digits than its factorization.

21184503480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129 (or 1116 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The spelling of 21184503480 in words is "twenty-one billion, one hundred eighty-four million, five hundred three thousand, four hundred eighty".