221938943636799 has 10 divisors (see below), whose sum is σ = 331538421976080. Its totient is φ = 147959295757812.

The previous prime is 221938943636797. The next prime is 221938943636803. The reversal of 221938943636799 is 997636349839122.

221938943636799 is a `hidden beast` number, since 2 + 2 + 1 + 9 + 3 + 89 + 436 + 36 + 79 + 9 = 666.

It is not a de Polignac number, because 221938943636799 - 2¹ = 221938943636797 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81), and also a Moran number because the ratio is a prime number: 2739986958479 = 221938943636799 / (2 + 2 + 1 + 9 + 3 + 8 + 9 + 4 + 3 + 6 + 3 + 6 + 7 + 9 + 9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221938943636797) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1369993479159 + ... + 1369993479320.

It is an arithmetic number, because the mean of its divisors is an integer number (33153842197608).

Almost surely, 2^{221938943636799} is an apocalyptic number.

221938943636799 is a deficient number, since it is larger than the sum of its proper divisors (109599478339281).

221938943636799 is an equidigital number, since it uses as much as digits as its factorization.

221938943636799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2739986958491 (or 2739986958482 counting only the distinct ones).

The product of its digits is 5714053632, while the sum is 81.

The spelling of 221938943636799 in words is "two hundred twenty-one trillion, nine hundred thirty-eight billion, nine hundred forty-three million, six hundred thirty-six thousand, seven hundred ninety-nine".