21234643212 has 24 divisors (see below), whose sum is σ = 50886623536. Its totient is φ = 6886911168.

The previous prime is 21234643189. The next prime is 21234643217.

21234643212 is nontrivially palindromic in base 10.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21234643212.

It is not an unprimeable number, because it can be changed into a prime (21234643217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23912443 + ... + 23913330.

Almost surely, 2^21234643212 is an apocalyptic number.

It is an amenable number.

21234643212 is an abundant number, since it is smaller than the sum of its proper divisors (29651980324).

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

21234643212 is a wasteful number, since it uses less digits than its factorization.

21234643212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47825817 (or 47825815 counting only the distinct ones).

The product of its digits is 13824, while the sum is 30.

The spelling of 21234643212 in words is "twenty-one billion, two hundred thirty-four million, six hundred forty-three thousand, two hundred twelve".