21231332300 has 72 divisors (see below), whose sum is σ = 48896464176. Its totient is φ = 7974236160.

The previous prime is 21231332281. The next prime is 21231332321. The reversal of 21231332300 is 323313212.

It is a super-3 number, since 3×21231332300³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 721679 + ... + 750521.

It is an arithmetic number, because the mean of its divisors is an integer number (679117558).

Almost surely, 2^21231332300 is an apocalyptic number.

21231332300 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 21231332300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24448232088).

21231332300 is an abundant number, since it is smaller than the sum of its proper divisors (27665131876).

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

21231332300 is a wasteful number, since it uses less digits than its factorization.

21231332300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29307 (or 29300 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21231332300 its reverse (323313212), we get a palindrome (21554645512).

The spelling of 21231332300 in words is "twenty-one billion, two hundred thirty-one million, three hundred thirty-two thousand, three hundred".