131221101 has 8 divisors (see below), whose sum is σ = 190867104. Its totient is φ = 79527920.

The previous prime is 131221093. The next prime is 131221117. The reversal of 131221101 is 101122131.

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 131221101 - 2³ = 131221093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131221121) 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, 1988166 + ... + 1988231.

It is an arithmetic number, because the mean of its divisors is an integer number (23858388).

Almost surely, 2^131221101 is an apocalyptic number.

131221101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131221101 is a deficient number, since it is larger than the sum of its proper divisors (59646003).

131221101 is a wasteful number, since it uses less digits than its factorization.

131221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3976411.

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 131221101 is about 11455.1779121932. The cubic root of 131221101 is about 508.1608768273.

Adding to 131221101 its reverse (101122131), we get a palindrome (232343232).

The spelling of 131221101 in words is "one hundred thirty-one million, two hundred twenty-one thousand, one hundred one".