21783343851612 has 108 divisors (see below), whose sum is σ = 64058688340920. Its totient is φ = 6223299066432.

The previous prime is 21783343851601. The next prime is 21783343851641. The reversal of 21783343851612 is 21615834338712.

21783343851612 is a `hidden beast` number, since 2 + 1 + 7 + 83 + 3 + 4 + 38 + 516 + 12 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 21139263 + ... + 22145769.

Almost surely, 2^{21783343851612} is an apocalyptic number.

It is an amenable number.

21783343851612 is an abundant number, since it is smaller than the sum of its proper divisors (42275344489308).

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

21783343851612 is a wasteful number, since it uses less digits than its factorization.

21783343851612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018800 (or 1018788 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 54.

The spelling of 21783343851612 in words is "twenty-one trillion, seven hundred eighty-three billion, three hundred forty-three million, eight hundred fifty-one thousand, six hundred twelve".