131214221 has 2 divisors, whose sum is σ = 131214222. Its totient is φ = 131214220.

The previous prime is 131214217. The next prime is 131214253. The reversal of 131214221 is 122412131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118504996 + 12709225 = 10886^2 + 3565^2 .

It is a cyclic number.

It is not a de Polignac number, because 131214221 - 2² = 131214217 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 131214221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131210221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65607110 + 65607111.

It is an arithmetic number, because the mean of its divisors is an integer number (65607111).

Almost surely, 2^131214221 is an apocalyptic number.

It is an amenable number.

131214221 is a deficient number, since it is larger than the sum of its proper divisors (1).

131214221 is an equidigital number, since it uses as much as digits as its factorization.

131214221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96, while the sum is 17.

The square root of 131214221 is about 11454.8776073776. The cubic root of 131214221 is about 508.1519956135.

Adding to 131214221 its reverse (122412131), we get a palindrome (253626352).

The spelling of 131214221 in words is "one hundred thirty-one million, two hundred fourteen thousand, two hundred twenty-one".