21301331024 has 80 divisors (see below), whose sum is σ = 45373770000. Its totient is φ = 9642565632.

The previous prime is 21301331011. The next prime is 21301331027. The reversal of 21301331024 is 42013310312.

It can be written as a sum of positive squares in 8 ways, for example, as 985960000 + 20315371024 = 31400^2 + 142532^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21301330987 and 21301331005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301331027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2180102 + ... + 2189850.

It is an arithmetic number, because the mean of its divisors is an integer number (567172125).

Almost surely, 2^21301331024 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 21301331024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22686885000).

21301331024 is an abundant number, since it is smaller than the sum of its proper divisors (24072438976).

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

21301331024 is a wasteful number, since it uses less digits than its factorization.

21301331024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10080 (or 10074 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21301331024 its reverse (42013310312), we get a palindrome (63314641336).

The spelling of 21301331024 in words is "twenty-one billion, three hundred one million, three hundred thirty-one thousand, twenty-four".