21420382480 has 240 divisors, whose sum is σ = 60001731072. Its totient is φ = 6963840000.

The previous prime is 21420382463. The next prime is 21420382499. The reversal of 21420382480 is 8428302412.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 28522105 + ... + 28522855.

Almost surely, 2^21420382480 is an apocalyptic number.

21420382480 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 21420382480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30000865536).

21420382480 is an abundant number, since it is smaller than the sum of its proper divisors (38581348592).

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

21420382480 is a wasteful number, since it uses less digits than its factorization.

21420382480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886 (or 849 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 34.

Adding to 21420382480 its reverse (8428302412), we get a palindrome (29848684892).

The spelling of 21420382480 in words is "twenty-one billion, four hundred twenty million, three hundred eighty-two thousand, four hundred eighty".