21203401300 has 72 divisors (see below), whose sum is σ = 50034781944. Its totient is φ = 7766691840.

The previous prime is 21203401279. The next prime is 21203401327. The reversal of 21203401300 is 310430212.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 3392363536 + 17811037764 = 58244^2 + 133458^2 .

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 23 ways as a sum of consecutive naturals, for example, 105649 + ... + 231448.

It is an arithmetic number, because the mean of its divisors is an integer number (694927527).

Almost surely, 2^21203401300 is an apocalyptic number.

21203401300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21203401300 is an abundant number, since it is smaller than the sum of its proper divisors (28831380644).

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

21203401300 is a wasteful number, since it uses less digits than its factorization.

21203401300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337165 (or 337158 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21203401300 its reverse (310430212), we get a palindrome (21513831512).

The spelling of 21203401300 in words is "twenty-one billion, two hundred three million, four hundred one thousand, three hundred".