131011021 has 2 divisors, whose sum is σ = 131011022. Its totient is φ = 131011020.

The previous prime is 131011019. The next prime is 131011033. The reversal of 131011021 is 120110131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119355625 + 11655396 = 10925^2 + 3414^2 .

It is a cyclic number.

It is not a de Polignac number, because 131011021 - 2¹ = 131011019 is a prime.

Together with 131011019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 131010989 and 131011007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131011051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65505510 + 65505511.

It is an arithmetic number, because the mean of its divisors is an integer number (65505511).

Almost surely, 2^131011021 is an apocalyptic number.

It is an amenable number.

131011021 is a deficient number, since it is larger than the sum of its proper divisors (1).

131011021 is an equidigital number, since it uses as much as digits as its factorization.

131011021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 131011021 is about 11446.0045867543. The cubic root of 131011021 is about 507.8895498917.

Adding to 131011021 its reverse (120110131), we get a palindrome (251121152).

It can be divided in two parts, 1310110 and 21, that added together give a palindrome (1310131).

The spelling of 131011021 in words is "one hundred thirty-one million, eleven thousand, twenty-one".