21424051044 has 96 divisors (see below), whose sum is σ = 60932390400. Its totient is φ = 6455803680.

The previous prime is 21424051037. The next prime is 21424051067. The reversal of 21424051044 is 44015042412.

21424051044 is a `hidden beast` number, since 2 + 142 + 4 + 0 + 510 + 4 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21424050999 and 21424051017.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 162279 + ... + 263025.

It is an arithmetic number, because the mean of its divisors is an integer number (634712400).

Almost surely, 2^21424051044 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 21424051044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30466195200).

21424051044 is an abundant number, since it is smaller than the sum of its proper divisors (39508339356).

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

21424051044 is a wasteful number, since it uses less digits than its factorization.

21424051044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100950 (or 100942 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

Adding to 21424051044 its reverse (44015042412), we get a palindrome (65439093456).

The spelling of 21424051044 in words is "twenty-one billion, four hundred twenty-four million, fifty-one thousand, forty-four".