21340034012 has 48 divisors (see below), whose sum is σ = 41869847040. Its totient is φ = 9431380800.

The previous prime is 21340033987. The next prime is 21340034021. The reversal of 21340034012 is 21043004312.

It is a super-2 number, since 2×21340034012² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 2977289 + ... + 2984447.

It is an arithmetic number, because the mean of its divisors is an integer number (872288480).

Almost surely, 2^21340034012 is an apocalyptic number.

21340034012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21340034012 is a deficient number, since it is larger than the sum of its proper divisors (20529813028).

21340034012 is a wasteful number, since it uses less digits than its factorization.

21340034012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9042 (or 9040 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21340034012 its reverse (21043004312), we get a palindrome (42383038324).

The spelling of 21340034012 in words is "twenty-one billion, three hundred forty million, thirty-four thousand, twelve".