21741856412 has 12 divisors (see below), whose sum is σ = 38065535256. Its totient is φ = 10865989200.

The previous prime is 21741856397. The next prime is 21741856441. The reversal of 21741856412 is 21465814712.

It is a self number, because there is not a number n which added to its sum of digits gives 21741856412.

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 3 ways as a sum of consecutive naturals, for example, 1224839 + ... + 1242462.

It is an arithmetic number, because the mean of its divisors is an integer number (3172127938).

Almost surely, 2^21741856412 is an apocalyptic number.

It is an amenable number.

21741856412 is a deficient number, since it is larger than the sum of its proper divisors (16323678844).

21741856412 is a wasteful number, since it uses less digits than its factorization.

21741856412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2469508 (or 2469506 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The spelling of 21741856412 in words is "twenty-one billion, seven hundred forty-one million, eight hundred fifty-six thousand, four hundred twelve".