21244303212400 has 60 divisors (see below), whose sum is σ = 51364530584392. Its totient is φ = 8443595646720.

The previous prime is 21244303212389. The next prime is 21244303212421. The reversal of 21244303212400 is 421230344212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 169079742 + ... + 169205341.

Almost surely, 2^{21244303212400} is an apocalyptic number.

21244303212400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21244303212400 is an abundant number, since it is smaller than the sum of its proper divisors (30120227371992).

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

21244303212400 is a wasteful number, since it uses less digits than its factorization.

21244303212400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338285258 (or 338285247 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21244303212400 its reverse (421230344212), we get a palindrome (21665533556612).

The spelling of 21244303212400 in words is "twenty-one trillion, two hundred forty-four billion, three hundred three million, two hundred twelve thousand, four hundred".