21312332300 has 144 divisors (see below), whose sum is σ = 55725600000. Its totient is φ = 6911412480.

The previous prime is 21312332233. The next prime is 21312332309. The reversal of 21312332300 is 323321312.

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

It is not an unprimeable number, because it can be changed into a prime (21312332309) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14216951 + ... + 14218449.

Almost surely, 2^21312332300 is an apocalyptic number.

21312332300 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 21312332300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27862800000).

21312332300 is an abundant number, since it is smaller than the sum of its proper divisors (34413267700).

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

21312332300 is a wasteful number, since it uses less digits than its factorization.

21312332300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2608 (or 2601 counting only the distinct ones).

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

Adding to 21312332300 its reverse (323321312), we get a palindrome (21635653612).

The spelling of 21312332300 in words is "twenty-one billion, three hundred twelve million, three hundred thirty-two thousand, three hundred".