131330021 has 2 divisors, whose sum is σ = 131330022. Its totient is φ = 131330020.

The previous prime is 131329999. The next prime is 131330053. The reversal of 131330021 is 120033131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130279396 + 1050625 = 11414^2 + 1025^2 .

It is an emirp because it is prime and its reverse (120033131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131330021 - 2¹⁰ = 131328997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131329978 and 131330005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131335021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65665010 + 65665011.

It is an arithmetic number, because the mean of its divisors is an integer number (65665011).

Almost surely, 2^131330021 is an apocalyptic number.

It is an amenable number.

131330021 is a deficient number, since it is larger than the sum of its proper divisors (1).

131330021 is an equidigital number, since it uses as much as digits as its factorization.

131330021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 131330021 is about 11459.9311079954. The cubic root of 131330021 is about 508.3014374923.

Adding to 131330021 its reverse (120033131), we get a palindrome (251363152).

The spelling of 131330021 in words is "one hundred thirty-one million, three hundred thirty thousand, twenty-one".