21410424 has 96 divisors (see below), whose sum is σ = 69189120. Its totient is φ = 5848128.

The previous prime is 21410423. The next prime is 21410437. The reversal of 21410424 is 42401412.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21410397 and 21410406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21410423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10669 + ... + 12515.

It is an arithmetic number, because the mean of its divisors is an integer number (720720).

Almost surely, 2^21410424 is an apocalyptic number.

21410424 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 21410424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34594560).

21410424 is an abundant number, since it is smaller than the sum of its proper divisors (47778696).

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

21410424 is a wasteful number, since it uses less digits than its factorization.

21410424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1889 (or 1882 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 21410424 is about 4627.1399373695. The cubic root of 21410424 is about 277.6781811593.

Adding to 21410424 its reverse (42401412), we get a palindrome (63811836).

The spelling of 21410424 in words is "twenty-one million, four hundred ten thousand, four hundred twenty-four".