21845665850312 has 8 divisors (see below), whose sum is σ = 40960623469350. Its totient is φ = 10922832925152.

The previous prime is 21845665850299. The next prime is 21845665850317. The reversal of 21845665850312 is 21305856654812.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18643448653636 + 3202217196676 = 4317806^2 + 1789474^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (21845665850317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1365354115637 + ... + 1365354115652.

Almost surely, 2^{21845665850312} is an apocalyptic number.

It is an amenable number.

21845665850312 is a deficient number, since it is larger than the sum of its proper divisors (19114957619038).

21845665850312 is a wasteful number, since it uses less digits than its factorization.

21845665850312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730708231295 (or 2730708231291 counting only the distinct ones).

The product of its (nonzero) digits is 13824000, while the sum is 56.

The spelling of 21845665850312 in words is "twenty-one trillion, eight hundred forty-five billion, six hundred sixty-five million, eight hundred fifty thousand, three hundred twelve".