21845376 has 240 divisors, whose sum is σ = 77384340. Its totient is φ = 6096384.

The previous prime is 21845353. The next prime is 21845387. The reversal of 21845376 is 67354812.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21845376.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 508011 + ... + 508053.

Almost surely, 2^21845376 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21845376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38692170).

21845376 is an abundant number, since it is smaller than the sum of its proper divisors (55538964).

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

21845376 is an equidigital number, since it uses as much as digits as its factorization.

21845376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83 (or 55 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 21845376 is about 4673.9037217298. The cubic root of 21845376 is about 279.5459307114.

The spelling of 21845376 in words is "twenty-one million, eight hundred forty-five thousand, three hundred seventy-six".