21113042004200 has 24 divisors (see below), whose sum is σ = 49087822660230. Its totient is φ = 8445216801600.

The previous prime is 21113042004157. The next prime is 21113042004209. The reversal of 21113042004200 is 240024031112.

It can be written as a sum of positive squares in 3 ways, for example, as 20589251101444 + 523790902756 = 4537538^2 + 723734^2 .

It is a super-2 number, since 2×21113042004200² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (21113042004209) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 52782604811 + ... + 52782605210.

Almost surely, 2^{21113042004200} is an apocalyptic number.

21113042004200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113042004200 is an abundant number, since it is smaller than the sum of its proper divisors (27974780656030).

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

21113042004200 is a wasteful number, since it uses less digits than its factorization.

21113042004200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105565210037 (or 105565210028 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21113042004200 its reverse (240024031112), we get a palindrome (21353066035312).

The spelling of 21113042004200 in words is "twenty-one trillion, one hundred thirteen billion, forty-two million, four thousand, two hundred".