21231310002 has 128 divisors (see below), whose sum is σ = 50850201600. Its totient is φ = 5781888000.

The previous prime is 21231309991. The next prime is 21231310021. The reversal of 21231310002 is 20001313212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 44323999 + ... + 44324477.

It is an arithmetic number, because the mean of its divisors is an integer number (397267200).

Almost surely, 2^21231310002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21231310002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25425100800).

21231310002 is an abundant number, since it is smaller than the sum of its proper divisors (29618891598).

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

21231310002 is a wasteful number, since it uses less digits than its factorization.

21231310002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21231310002 its reverse (20001313212), we get a palindrome (41232623214).

The spelling of 21231310002 in words is "twenty-one billion, two hundred thirty-one million, three hundred ten thousand, two".