131221120335 has 32 divisors (see below), whose sum is σ = 216120623040. Its totient is φ = 67956215808.

The previous prime is 131221120309. The next prime is 131221120339. The reversal of 131221120335 is 533021122131.

It is a happy number.

It is not a de Polignac number, because 131221120335 - 2¹² = 131221116239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221120339) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 773700 + ... + 927929.

It is an arithmetic number, because the mean of its divisors is an integer number (6753769470).

Almost surely, 2^131221120335 is an apocalyptic number.

131221120335 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

131221120335 is a deficient number, since it is larger than the sum of its proper divisors (84899502705).

131221120335 is a wasteful number, since it uses less digits than its factorization.

131221120335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701787.

The product of its (nonzero) digits is 1080, while the sum is 24.

Adding to 131221120335 its reverse (533021122131), we get a palindrome (664242242466).

The spelling of 131221120335 in words is "one hundred thirty-one billion, two hundred twenty-one million, one hundred twenty thousand, three hundred thirty-five".