21613250424 has 256 divisors, whose sum is σ = 62096025600. Its totient is φ = 6226771968.

The previous prime is 21613250401. The next prime is 21613250429. The reversal of 21613250424 is 42405231612.

It is a junction number, because it is equal to n+sod(n) for n = 21613250391 and 21613250400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21613250429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 49914912 + ... + 49915344.

It is an arithmetic number, because the mean of its divisors is an integer number (242562600).

Almost surely, 2^21613250424 is an apocalyptic number.

21613250424 is a gapful number since it is divisible by the number (24) 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 21613250424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31048012800).

21613250424 is an abundant number, since it is smaller than the sum of its proper divisors (40482775176).

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

21613250424 is a wasteful number, since it uses less digits than its factorization.

21613250424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662 (or 658 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The spelling of 21613250424 in words is "twenty-one billion, six hundred thirteen million, two hundred fifty thousand, four hundred twenty-four".