21841091424 has 240 divisors, whose sum is σ = 65212874496. Its totient is φ = 7170508800.

The previous prime is 21841091401. The next prime is 21841091429. The reversal of 21841091424 is 42419014812.

21841091424 is a `hidden beast` number, since 218 + 4 + 10 + 9 + 1 + 424 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21841091429) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 77726164 + ... + 77726444.

Almost surely, 2^21841091424 is an apocalyptic number.

21841091424 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 21841091424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32606437248).

21841091424 is an abundant number, since it is smaller than the sum of its proper divisors (43371783072).

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

21841091424 is a wasteful number, since it uses less digits than its factorization.

21841091424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651 (or 634 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The spelling of 21841091424 in words is "twenty-one billion, eight hundred forty-one million, ninety-one thousand, four hundred twenty-four".