1131221330221 has 4 divisors (see below), whose sum is σ = 1135395578944. Its totient is φ = 1127047081500.

The previous prime is 1131221330219. The next prime is 1131221330237. The reversal of 1131221330221 is 1220331221311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1131221330221 - 2¹ = 1131221330219 is a prime.

It is a super-5 number, since 5×1131221330221⁵ (a number of 61 digits) contains 55555 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1131221330192 and 1131221330201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131221330821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2087123955 + ... + 2087124496.

It is an arithmetic number, because the mean of its divisors is an integer number (283848894736).

Almost surely, 2^{1131221330221} is an apocalyptic number.

It is an amenable number.

1131221330221 is a deficient number, since it is larger than the sum of its proper divisors (4174248723).

1131221330221 is an equidigital number, since it uses as much as digits as its factorization.

1131221330221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4174248722.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1131221330221 its reverse (1220331221311), we get a palindrome (2351552551532).

The spelling of 1131221330221 in words is "one trillion, one hundred thirty-one billion, two hundred twenty-one million, three hundred thirty thousand, two hundred twenty-one".