131221338 has 8 divisors (see below), whose sum is σ = 262442688. Its totient is φ = 43740444.

The previous prime is 131221327. The next prime is 131221339. The reversal of 131221338 is 833122131.

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

131221338 is an admirable 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, 10935106 + ... + 10935117.

It is an arithmetic number, because the mean of its divisors is an integer number (32805336).

Almost surely, 2^131221338 is an apocalyptic number.

131221338 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131221338 is a wasteful number, since it uses less digits than its factorization.

131221338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21870228.

The product of its digits is 864, while the sum is 24.

The square root of 131221338 is about 11455.1882568555. The cubic root of 131221338 is about 508.1611827589.

Adding to 131221338 its reverse (833122131), we get a palindrome (964343469).

The spelling of 131221338 in words is "one hundred thirty-one million, two hundred twenty-one thousand, three hundred thirty-eight".