21310243724 has 96 divisors (see below), whose sum is σ = 46847324160. Its totient is φ = 8240097600.

The previous prime is 21310243723. The next prime is 21310243741. The reversal of 21310243724 is 42734201312.

It is not an unprimeable number, because it can be changed into a prime (21310243723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36303359 + ... + 36303945.

It is an arithmetic number, because the mean of its divisors is an integer number (487992960).

Almost surely, 2^21310243724 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 21310243724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23423662080).

21310243724 is an abundant number, since it is smaller than the sum of its proper divisors (25537080436).

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

21310243724 is a wasteful number, since it uses less digits than its factorization.

21310243724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299 (or 1297 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 29.

The spelling of 21310243724 in words is "twenty-one billion, three hundred ten million, two hundred forty-three thousand, seven hundred twenty-four".