21213213300 has 54 divisors (see below), whose sum is σ = 66491641398. Its totient is φ = 5656856640.

The previous prime is 21213213269. The next prime is 21213213311. The reversal of 21213213300 is 331231212.

21213213300 is a `hidden beast` number, since 2 + 12 + 1 + 321 + 330 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 5120261136 + 16092952164 = 71556^2 + 126858^2 .

It is a super-2 number, since 2×21213213300² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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 17 ways as a sum of consecutive naturals, for example, 11784219 + ... + 11786018.

Almost surely, 2^21213213300 is an apocalyptic number.

21213213300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21213213300 is an abundant number, since it is smaller than the sum of its proper divisors (45278428098).

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

21213213300 is a wasteful number, since it uses less digits than its factorization.

21213213300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23570257 (or 23570247 counting only the distinct ones).

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

Adding to 21213213300 its reverse (331231212), we get a palindrome (21544444512).

The spelling of 21213213300 in words is "twenty-one billion, two hundred thirteen million, two hundred thirteen thousand, three hundred".