131912221 has 8 divisors (see below), whose sum is σ = 153964800. Its totient is φ = 110661648.

The previous prime is 131912191. The next prime is 131912237. The reversal of 131912221 is 122219131.

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 131912221 - 2⁹ = 131911709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131912192 and 131912201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131912281) 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, 200146 + ... + 200803.

It is an arithmetic number, because the mean of its divisors is an integer number (19245600).

Almost surely, 2^131912221 is an apocalyptic number.

It is an amenable number.

131912221 is a deficient number, since it is larger than the sum of its proper divisors (22052579).

131912221 is an equidigital number, since it uses as much as digits as its factorization.

131912221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401003.

The product of its digits is 216, while the sum is 22.

The square root of 131912221 is about 11485.3045671414. The cubic root of 131912221 is about 509.0514484633.

The spelling of 131912221 in words is "one hundred thirty-one million, nine hundred twelve thousand, two hundred twenty-one".