1331233112221 has 8 divisors (see below), whose sum is σ = 1335056832824. Its totient is φ = 1327410754560.

The previous prime is 1331233112173. The next prime is 1331233112239. The reversal of 1331233112221 is 1222113321331.

It can be written as a sum of positive squares in 4 ways, for example, as 30752883225 + 1300480228996 = 175365^2 + 1140386^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1331233112221 - 2¹⁹ = 1331232587933 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 (1331233112281) 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, 1631905 + ... + 2307721.

It is an arithmetic number, because the mean of its divisors is an integer number (166882104103).

Almost surely, 2^{1331233112221} is an apocalyptic number.

It is an amenable number.

1331233112221 is a deficient number, since it is larger than the sum of its proper divisors (3823720603).

1331233112221 is an equidigital number, since it uses as much as digits as its factorization.

1331233112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681471.

The product of its digits is 1296, while the sum is 25.

Adding to 1331233112221 its reverse (1222113321331), we get a palindrome (2553346433552).

The spelling of 1331233112221 in words is "one trillion, three hundred thirty-one billion, two hundred thirty-three million, one hundred twelve thousand, two hundred twenty-one".