21234043212 has 12 divisors (see below), whose sum is σ = 49546100856. Its totient is φ = 7078014400.

The previous prime is 21234043211. The next prime is 21234043219.

It is a happy number.

21234043212 is nontrivially palindromic in base 10.

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

It is a super-2 number, since 2×21234043212² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21234043211) 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, 884751789 + ... + 884751812.

It is an arithmetic number, because the mean of its divisors is an integer number (4128841738).

Almost surely, 2^21234043212 is an apocalyptic number.

It is an amenable number.

21234043212 is an abundant number, since it is smaller than the sum of its proper divisors (28312057644).

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

21234043212 is a wasteful number, since it uses less digits than its factorization.

21234043212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1769503608 (or 1769503606 counting only the distinct ones).

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

It can be divided in two parts, 212340 and 43212, that added together give a palindrome (255552).

The spelling of 21234043212 in words is "twenty-one billion, two hundred thirty-four million, forty-three thousand, two hundred twelve".