131221333 has 4 divisors (see below), whose sum is σ = 132695820. Its totient is φ = 129746848.

The previous prime is 131221327. The next prime is 131221339. The reversal of 131221333 is 333122131.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (131221327) and next prime (131221339).

It can be written as a sum of positive squares in 2 ways, for example, as 9847044 + 121374289 = 3138^2 + 11017^2 .

It is a cyclic number.

It is not a de Polignac number, because 131221333 - 2⁵ = 131221301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131221333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221339) 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, 737110 + ... + 737287.

It is an arithmetic number, because the mean of its divisors is an integer number (33173955).

Almost surely, 2^131221333 is an apocalyptic number.

It is an amenable number.

131221333 is a deficient number, since it is larger than the sum of its proper divisors (1474487).

131221333 is an equidigital number, since it uses as much as digits as its factorization.

131221333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474486.

The product of its digits is 324, while the sum is 19.

The square root of 131221333 is about 11455.1880386138. The cubic root of 131221333 is about 508.1611763046.

Adding to 131221333 its reverse (333122131), we get a palindrome (464343464).

The spelling of 131221333 in words is "one hundred thirty-one million, two hundred twenty-one thousand, three hundred thirty-three".