21312132300 has 108 divisors (see below), whose sum is σ = 67101885760. Its totient is φ = 5657696640.

The previous prime is 21312132293. The next prime is 21312132313. The reversal of 21312132300 is 323121312.

21312132300 is a `hidden beast` number, since 21 + 312 + 1 + 32 + 300 = 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 35 ways as a sum of consecutive naturals, for example, 147606 + ... + 253794.

Almost surely, 2^21312132300 is an apocalyptic number.

21312132300 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 21312132300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33550942880).

21312132300 is an abundant number, since it is smaller than the sum of its proper divisors (45789753460).

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

21312132300 is a wasteful number, since it uses less digits than its factorization.

21312132300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106432 (or 106422 counting only the distinct ones).

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

Adding to 21312132300 its reverse (323121312), we get a palindrome (21635253612).

The spelling of 21312132300 in words is "twenty-one billion, three hundred twelve million, one hundred thirty-two thousand, three hundred".