1331221331 has 8 divisors (see below), whose sum is σ = 1454550528. Its totient is φ = 1208277000.

The previous prime is 1331221321. The next prime is 1331221351.

1331221331 is nontrivially palindromic in base 10.

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 1331221331 - 2²⁶ = 1264112467 is a prime.

It is a super-2 number, since 2×1331221331² = 3544300464218823122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331221321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88955 + ... + 102836.

It is an arithmetic number, because the mean of its divisors is an integer number (181818816).

Almost surely, 2^1331221331 is an apocalyptic number.

1331221331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1331221331 is a deficient number, since it is larger than the sum of its proper divisors (123329197).

1331221331 is a wasteful number, since it uses less digits than its factorization.

1331221331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192433.

The product of its digits is 324, while the sum is 20.

The square root of 1331221331 is about 36485.9059226984. The cubic root of 1331221331 is about 1100.0609693479.

It can be divided in two parts, 13312 and 21331, that added together give a palindrome (34643).

The spelling of 1331221331 in words is "one billion, three hundred thirty-one million, two hundred twenty-one thousand, three hundred thirty-one".