21242012204 has 24 divisors (see below), whose sum is σ = 44331157248. Its totient is φ = 8707905360.

The previous prime is 21242012201. The next prime is 21242012257. The reversal of 21242012204 is 40221024212.

It is not an unprimeable number, because it can be changed into a prime (21242012201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16491602 + ... + 16492889.

It is an arithmetic number, because the mean of its divisors is an integer number (1847131552).

Almost surely, 2^21242012204 is an apocalyptic number.

It is an amenable number.

21242012204 is an abundant number, since it is smaller than the sum of its proper divisors (23089145044).

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

21242012204 is a wasteful number, since it uses less digits than its factorization.

21242012204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32984525 (or 32984523 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21242012204 its reverse (40221024212), we get a palindrome (61463036416).

The spelling of 21242012204 in words is "twenty-one billion, two hundred forty-two million, twelve thousand, two hundred four".