131102221 has 2 divisors, whose sum is σ = 131102222. Its totient is φ = 131102220.

The previous prime is 131102177. The next prime is 131102263. The reversal of 131102221 is 122201131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130074025 + 1028196 = 11405^2 + 1014^2 .

It is a cyclic number.

It is not a de Polignac number, because 131102221 - 2⁹ = 131101709 is a prime.

It is a super-2 number, since 2×131102221² = 34375584702265682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131102021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65551110 + 65551111.

It is an arithmetic number, because the mean of its divisors is an integer number (65551111).

Almost surely, 2^131102221 is an apocalyptic number.

It is an amenable number.

131102221 is a deficient number, since it is larger than the sum of its proper divisors (1).

131102221 is an equidigital number, since it uses as much as digits as its factorization.

131102221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 131102221 is about 11449.9878165874. The cubic root of 131102221 is about 508.0073740327.

Adding to 131102221 its reverse (122201131), we get a palindrome (253303352).

The spelling of 131102221 in words is "one hundred thirty-one million, one hundred two thousand, two hundred twenty-one".