21263236212 has 24 divisors (see below), whose sum is σ = 49716108736. Its totient is φ = 7073189568.

The previous prime is 21263236199. The next prime is 21263236249.

21263236212 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 21263236212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1813393 + ... + 1825080.

Almost surely, 2^21263236212 is an apocalyptic number.

It is an amenable number.

21263236212 is an abundant number, since it is smaller than the sum of its proper divisors (28452872524).

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

21263236212 is a wasteful number, since it uses less digits than its factorization.

21263236212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3638967 (or 3638965 counting only the distinct ones).

The product of its digits is 10368, while the sum is 30.

The spelling of 21263236212 in words is "twenty-one billion, two hundred sixty-three million, two hundred thirty-six thousand, two hundred twelve".