21404230212 has 12 divisors (see below), whose sum is σ = 49943203856. Its totient is φ = 7134743400.

The previous prime is 21404230193. The next prime is 21404230213. The reversal of 21404230212 is 21203240412.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (21404230213) 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 3 ways as a sum of consecutive naturals, for example, 891842914 + ... + 891842937.

Almost surely, 2^21404230212 is an apocalyptic number.

It is an amenable number.

21404230212 is an abundant number, since it is smaller than the sum of its proper divisors (28538973644).

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

21404230212 is a wasteful number, since it uses less digits than its factorization.

21404230212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1783685858 (or 1783685856 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21404230212 its reverse (21203240412), we get a palindrome (42607470624).

The spelling of 21404230212 in words is "twenty-one billion, four hundred four million, two hundred thirty thousand, two hundred twelve".