21243001204 has 12 divisors (see below), whose sum is σ = 38791567584. Its totient is φ = 10159696184.

The previous prime is 21243001201. The next prime is 21243001229. The reversal of 21243001204 is 40210034212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21243001201) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 115451002 + ... + 115451185.

It is an arithmetic number, because the mean of its divisors is an integer number (3232630632).

Almost surely, 2^21243001204 is an apocalyptic number.

It is an amenable number.

21243001204 is a deficient number, since it is larger than the sum of its proper divisors (17548566380).

21243001204 is a wasteful number, since it uses less digits than its factorization.

21243001204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230902214 (or 230902212 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21243001204 its reverse (40210034212), we get a palindrome (61453035416).

The spelling of 21243001204 in words is "twenty-one billion, two hundred forty-three million, one thousand, two hundred four".