21231332100000 has 864 divisors, whose sum is σ = 85166453998080. Its totient is φ = 4969440000000.

The previous prime is 21231332099993. The next prime is 21231332100023. The reversal of 21231332100000 is 123313212.

21231332100000 is a `hidden beast` number, since 2 + 1 + 231 + 332 + 100 + 0 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 287063025 + ... + 287136975.

It is an arithmetic number, because the mean of its divisors is an integer number (98572284720).

Almost surely, 2^{21231332100000} is an apocalyptic number.

21231332100000 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 21231332100000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42583226999040).

21231332100000 is an abundant number, since it is smaller than the sum of its proper divisors (63935121898080).

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

21231332100000 is a wasteful number, since it uses less digits than its factorization.

21231332100000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74032 (or 74001 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21231332100000 its reverse (123313212), we get a palindrome (21231455413212).

The spelling of 21231332100000 in words is "twenty-one trillion, two hundred thirty-one billion, three hundred thirty-two million, one hundred thousand".