21420213200 has 60 divisors (see below), whose sum is σ = 51478848000. Its totient is φ = 8565290880.

The previous prime is 21420213193. The next prime is 21420213223. The reversal of 21420213200 is 231202412.

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 11 ways as a sum of consecutive naturals, for example, 1580051 + ... + 1593549.

It is an arithmetic number, because the mean of its divisors is an integer number (857980800).

Almost surely, 2^21420213200 is an apocalyptic number.

21420213200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21420213200 is an abundant number, since it is smaller than the sum of its proper divisors (30058634800).

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

21420213200 is a wasteful number, since it uses less digits than its factorization.

21420213200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17484 (or 17473 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21420213200 its reverse (231202412), we get a palindrome (21651415612).

The spelling of 21420213200 in words is "twenty-one billion, four hundred twenty million, two hundred thirteen thousand, two hundred".