21124124441424 has 80 divisors (see below), whose sum is σ = 60638170367040. Its totient is φ = 7040897585280.

The previous prime is 21124124441419. The next prime is 21124124441479. The reversal of 21124124441424 is 42414442142112.

21124124441424 is a `hidden beast` number, since 2 + 112 + 4 + 124 + 4 + 414 + 2 + 4 = 666.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4753039 + ... + 8052305.

It is an arithmetic number, because the mean of its divisors is an integer number (757977129588).

Almost surely, 2^{21124124441424} is an apocalyptic number.

21124124441424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21124124441424 is an abundant number, since it is smaller than the sum of its proper divisors (39514045925616).

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

21124124441424 is a wasteful number, since it uses less digits than its factorization.

21124124441424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3314105 (or 3314093 counting only the distinct ones).

The product of its digits is 65536, while the sum is 36.

Adding to 21124124441424 its reverse (42414442142112), we get a palindrome (63538566583536).

The spelling of 21124124441424 in words is "twenty-one trillion, one hundred twenty-four billion, one hundred twenty-four million, four hundred forty-one thousand, four hundred twenty-four".