21313124032 has 56 divisors (see below), whose sum is σ = 42731100720. Its totient is φ = 10546467840.

The previous prime is 21313124017. The next prime is 21313124039. The reversal of 21313124032 is 23042131312.

It is a junction number, because it is equal to n+sod(n) for n = 21313123994 and 21313124012.

It is not an unprimeable number, because it can be changed into a prime (21313124039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9953682 + ... + 9955822.

It is an arithmetic number, because the mean of its divisors is an integer number (763055370).

Almost surely, 2^21313124032 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 21313124032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21365550360).

21313124032 is an abundant number, since it is smaller than the sum of its proper divisors (21417976688).

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

21313124032 is a wasteful number, since it uses less digits than its factorization.

21313124032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3689 (or 3679 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21313124032 its reverse (23042131312), we get a palindrome (44355255344).

The spelling of 21313124032 in words is "twenty-one billion, three hundred thirteen million, one hundred twenty-four thousand, thirty-two".