21240313044 has 12 divisors (see below), whose sum is σ = 49560730464. Its totient is φ = 7080104344.

The previous prime is 21240313021. The next prime is 21240313049. The reversal of 21240313044 is 44031304212.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240313049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 885013032 + ... + 885013055.

It is an arithmetic number, because the mean of its divisors is an integer number (4130060872).

Almost surely, 2^21240313044 is an apocalyptic number.

It is an amenable number.

21240313044 is an abundant number, since it is smaller than the sum of its proper divisors (28320417420).

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

21240313044 is a wasteful number, since it uses less digits than its factorization.

21240313044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1770026094 (or 1770026092 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21240313044 its reverse (44031304212), we get a palindrome (65271617256).

The spelling of 21240313044 in words is "twenty-one billion, two hundred forty million, three hundred thirteen thousand, forty-four".