19445233356221 has 16 divisors (see below), whose sum is σ = 19644170613120. Its totient is φ = 19246774632960.

The previous prime is 19445233356191. The next prime is 19445233356271. The reversal of 19445233356221 is 12265333254491.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19445233356221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19445233356221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19445233356271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 842466401 + ... + 842489481.

It is an arithmetic number, because the mean of its divisors is an integer number (1227760663320).

Almost surely, 2^{19445233356221} is an apocalyptic number.

It is an amenable number.

19445233356221 is a deficient number, since it is larger than the sum of its proper divisors (198937256899).

19445233356221 is a wasteful number, since it uses less digits than its factorization.

19445233356221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33076.

The product of its digits is 4665600, while the sum is 50.

The spelling of 19445233356221 in words is "nineteen trillion, four hundred forty-five billion, two hundred thirty-three million, three hundred fifty-six thousand, two hundred twenty-one".