21231331000 has 128 divisors (see below), whose sum is σ = 54321995520. Its totient is φ = 7702800000.

The previous prime is 21231330971. The next prime is 21231331021. The reversal of 21231331000 is 13313212.

It is a super-2 number, since 2×21231331000² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5399035 + ... + 5402965.

It is an arithmetic number, because the mean of its divisors is an integer number (424390590).

Almost surely, 2^21231331000 is an apocalyptic number.

21231331000 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 21231331000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27160997760).

21231331000 is an abundant number, since it is smaller than the sum of its proper divisors (33090664520).

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

21231331000 is a wasteful number, since it uses less digits than its factorization.

21231331000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4454 (or 4440 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 21231331000 its reverse (13313212), we get a palindrome (21244644212).

The spelling of 21231331000 in words is "twenty-one billion, two hundred thirty-one million, three hundred thirty-one thousand".