21340434124 has 12 divisors (see below), whose sum is σ = 37583631904. Its totient is φ = 10602253584.

The previous prime is 21340434109. The next prime is 21340434133. The reversal of 21340434124 is 42143404312.

It is a junction number, because it is equal to n+sod(n) for n = 21340434092 and 21340434101.

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 3 ways as a sum of consecutive naturals, for example, 16990164 + ... + 16991419.

Almost surely, 2^21340434124 is an apocalyptic number.

It is an amenable number.

21340434124 is a deficient number, since it is larger than the sum of its proper divisors (16243197780).

21340434124 is a wasteful number, since it uses less digits than its factorization.

21340434124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33981744 (or 33981742 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21340434124 its reverse (42143404312), we get a palindrome (63483838436).

The spelling of 21340434124 in words is "twenty-one billion, three hundred forty million, four hundred thirty-four thousand, one hundred twenty-four".