221121111136663 has 8 divisors (see below), whose sum is σ = 221566315209120. Its totient is φ = 220676226325920.

The previous prime is 221121111136577. The next prime is 221121111136691. The reversal of 221121111136663 is 366631111121122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221121111136663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121111136063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78428808 + ... + 81199261.

It is an arithmetic number, because the mean of its divisors is an integer number (27695789401140).

Almost surely, 2^{221121111136663} is an apocalyptic number.

221121111136663 is a deficient number, since it is larger than the sum of its proper divisors (445204072457).

221121111136663 is a wasteful number, since it uses less digits than its factorization.

221121111136663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159630857.

The product of its digits is 15552, while the sum is 37.

Adding to 221121111136663 its reverse (366631111121122), we get a palindrome (587752222257785).

The spelling of 221121111136663 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, one hundred eleven million, one hundred thirty-six thousand, six hundred sixty-three".