21403234212 has 24 divisors (see below), whose sum is σ = 50759584512. Its totient is φ = 7017453600.

The previous prime is 21403234199. The next prime is 21403234301. The reversal of 21403234212 is 21243230412.

It is a happy number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 14618964 + ... + 14620427.

It is an arithmetic number, because the mean of its divisors is an integer number (2114982688).

Almost surely, 2^21403234212 is an apocalyptic number.

It is an amenable number.

21403234212 is an abundant number, since it is smaller than the sum of its proper divisors (29356350300).

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

21403234212 is a wasteful number, since it uses less digits than its factorization.

21403234212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29239459 (or 29239457 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21403234212 its reverse (21243230412), we get a palindrome (42646464624).

The spelling of 21403234212 in words is "twenty-one billion, four hundred three million, two hundred thirty-four thousand, two hundred twelve".