21204113203 has 16 divisors (see below), whose sum is σ = 26285136640. Its totient is φ = 16656173856.

The previous prime is 21204113201. The next prime is 21204113219. The reversal of 21204113203 is 30231140212.

It is a happy number.

It is not a de Polignac number, because 21204113203 - 2¹ = 21204113201 is a prime.

It is a super-2 number, since 2×21204113203² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21204113201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 825525 + ... + 850822.

It is an arithmetic number, because the mean of its divisors is an integer number (1642821040).

Almost surely, 2^21204113203 is an apocalyptic number.

21204113203 is a deficient number, since it is larger than the sum of its proper divisors (5081023437).

21204113203 is a wasteful number, since it uses less digits than its factorization.

21204113203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1676506.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21204113203 its reverse (30231140212), we get a palindrome (51435253415).

The spelling of 21204113203 in words is "twenty-one billion, two hundred four million, one hundred thirteen thousand, two hundred three".