221365733745 has 16 divisors (see below), whose sum is σ = 381430187712. Its totient is φ = 108980053440.

The previous prime is 221365733683. The next prime is 221365733747. The reversal of 221365733745 is 547337563122.

It is a happy number.

It is not a de Polignac number, because 221365733745 - 2¹² = 221365729649 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221365733694 and 221365733703.

It is not an unprimeable number, because it can be changed into a prime (221365733747) 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, 567604251 + ... + 567604640.

It is an arithmetic number, because the mean of its divisors is an integer number (23839386732).

Almost surely, 2^221365733745 is an apocalyptic number.

It is an amenable number.

221365733745 is a deficient number, since it is larger than the sum of its proper divisors (160064453967).

221365733745 is a wasteful number, since it uses less digits than its factorization.

221365733745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135208912.

The product of its digits is 3175200, while the sum is 48.

The spelling of 221365733745 in words is "two hundred twenty-one billion, three hundred sixty-five million, seven hundred thirty-three thousand, seven hundred forty-five".