21231303310020 has 144 divisors (see below), whose sum is σ = 61087462813440. Its totient is φ = 5507204940288.

The previous prime is 21231303310001. The next prime is 21231303310031. The reversal of 21231303310020 is 2001330313212.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 74782896 + ... + 75066264.

It is an arithmetic number, because the mean of its divisors is an integer number (424218491760).

Almost surely, 2^{21231303310020} is an apocalyptic number.

21231303310020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21231303310020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30543731406720).

21231303310020 is an abundant number, since it is smaller than the sum of its proper divisors (39856159503420).

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

21231303310020 is a wasteful number, since it uses less digits than its factorization.

21231303310020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283754 (or 283589 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21231303310020 its reverse (2001330313212), we get a palindrome (23232633623232).

The spelling of 21231303310020 in words is "twenty-one trillion, two hundred thirty-one billion, three hundred three million, three hundred ten thousand, twenty".