131312231021 has 2 divisors, whose sum is σ = 131312231022. Its totient is φ = 131312231020.

The previous prime is 131312230993. The next prime is 131312231041. The reversal of 131312231021 is 120132213131.

It is a happy number.

It is an a-pointer prime, because the next prime (131312231041) can be obtained adding 131312231021 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108316024996 + 22996206025 = 329114^2 + 151645^2 .

It is a cyclic number.

It is not a de Polignac number, because 131312231021 - 2⁶ = 131312230957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 131312230984 and 131312231002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131312231041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65656115510 + 65656115511.

It is an arithmetic number, because the mean of its divisors is an integer number (65656115511).

Almost surely, 2^131312231021 is an apocalyptic number.

It is an amenable number.

131312231021 is a deficient number, since it is larger than the sum of its proper divisors (1).

131312231021 is an equidigital number, since it uses as much as digits as its factorization.

131312231021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 131312231021 its reverse (120132213131), we get a palindrome (251444444152).

The spelling of 131312231021 in words is "one hundred thirty-one billion, three hundred twelve million, two hundred thirty-one thousand, twenty-one".