21213100212300 has 216 divisors, whose sum is σ = 66630576370176. Its totient is φ = 5644987793280.

The previous prime is 21213100212257. The next prime is 21213100212313. The reversal of 21213100212300 is 321200131212.

21213100212300 is a `hidden beast` number, since 2 + 121 + 31 + 0 + 0 + 212 + 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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 972933199 + ... + 972955001.

Almost surely, 2^{21213100212300} is an apocalyptic number.

21213100212300 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 21213100212300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33315288185088).

21213100212300 is an abundant number, since it is smaller than the sum of its proper divisors (45417476157876).

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

21213100212300 is a wasteful number, since it uses less digits than its factorization.

21213100212300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24037 (or 24027 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21213100212300 its reverse (321200131212), we get a palindrome (21534300343512).

The spelling of 21213100212300 in words is "twenty-one trillion, two hundred thirteen billion, one hundred million, two hundred twelve thousand, three hundred".