21210220021300 has 18 divisors (see below), whose sum is σ = 46026177446438. Its totient is φ = 8484088008480.

The previous prime is 21210220021297. The next prime is 21210220021307. The reversal of 21210220021300 is 312002201212.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 4214620126116 + 16995599895184 = 2052954^2 + 4122572^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210220021307) 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 5 ways as a sum of consecutive naturals, for example, 106051100007 + ... + 106051100206.

Almost surely, 2^{21210220021300} is an apocalyptic number.

21210220021300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21210220021300 is an abundant number, since it is smaller than the sum of its proper divisors (24815957425138).

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

21210220021300 is a wasteful number, since it uses less digits than its factorization.

21210220021300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212102200227 (or 212102200220 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21210220021300 its reverse (312002201212), we get a palindrome (21522222222512).

The spelling of 21210220021300 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty million, twenty-one thousand, three hundred".