21340430244 has 72 divisors (see below), whose sum is σ = 61666125248. Its totient is φ = 6095684160.

The previous prime is 21340430227. The next prime is 21340430263. The reversal of 21340430244 is 44203404312.

It is a happy number.

21340430244 is a `hidden beast` number, since 2 + 13 + 404 + 3 + 0 + 244 = 666.

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 23 ways as a sum of consecutive naturals, for example, 1248234 + ... + 1265214.

Almost surely, 2^21340430244 is an apocalyptic number.

It is an amenable number.

21340430244 is an abundant number, since it is smaller than the sum of its proper divisors (40325695004).

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

21340430244 is a wasteful number, since it uses less digits than its factorization.

21340430244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21985 (or 21980 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 21340430244 its reverse (44203404312), we get a palindrome (65543834556).

It can be divided in two parts, 21340 and 430244, that added together give a square (451584 = 672²).

The spelling of 21340430244 in words is "twenty-one billion, three hundred forty million, four hundred thirty thousand, two hundred forty-four".