21212300321300 has 108 divisors (see below), whose sum is σ = 51887404181088. Its totient is φ = 7464738744000.

The previous prime is 21212300321131. The next prime is 21212300321309. The reversal of 21212300321300 is 312300321212.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212300321309) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 8976152 + ... + 11090351.

Almost surely, 2^{21212300321300} is an apocalyptic number.

21212300321300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212300321300 is an abundant number, since it is smaller than the sum of its proper divisors (30675103859788).

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

21212300321300 is a wasteful number, since it uses less digits than its factorization.

21212300321300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20066590 (or 20066552 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21212300321300 its reverse (312300321212), we get a palindrome (21524600642512).

The spelling of 21212300321300 in words is "twenty-one trillion, two hundred twelve billion, three hundred million, three hundred twenty-one thousand, three hundred".