21424609572420 has 192 divisors, whose sum is σ = 63251918585856. Its totient is φ = 5410408834560.

The previous prime is 21424609572397. The next prime is 21424609572439. The reversal of 21424609572420 is 2427590642412.

It is a self number, because there is not a number n which added to its sum of digits gives 21424609572420.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 657119839 + ... + 657152441.

It is an arithmetic number, because the mean of its divisors is an integer number (329437075968).

Almost surely, 2^{21424609572420} is an apocalyptic number.

21424609572420 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 21424609572420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31625959292928).

21424609572420 is an abundant number, since it is smaller than the sum of its proper divisors (41827309013436).

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

21424609572420 is a wasteful number, since it uses less digits than its factorization.

21424609572420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40210 (or 40208 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 48.

The spelling of 21424609572420 in words is "twenty-one trillion, four hundred twenty-four billion, six hundred nine million, five hundred seventy-two thousand, four hundred twenty".