21124444000 has 96 divisors (see below), whose sum is σ = 56621309472. Its totient is φ = 7681600000.

The previous prime is 21124443997. The next prime is 21124444007. The reversal of 21124444000 is 44442112.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124444007) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 196051 + ... + 284050.

It is an arithmetic number, because the mean of its divisors is an integer number (589805307).

Almost surely, 2^21124444000 is an apocalyptic number.

21124444000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21124444000 is an abundant number, since it is smaller than the sum of its proper divisors (35496865472).

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

21124444000 is a wasteful number, since it uses less digits than its factorization.

21124444000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480137 (or 480119 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

Adding to 21124444000 its reverse (44442112), we get a palindrome (21168886112).

It can be divided in two parts, 21124 and 444000, that added together give a square (465124 = 682²).

The spelling of 21124444000 in words is "twenty-one billion, one hundred twenty-four million, four hundred forty-four thousand".