10131221231 has 2 divisors, whose sum is σ = 10131221232. Its totient is φ = 10131221230.

The previous prime is 10131221207. The next prime is 10131221239. The reversal of 10131221231 is 13212213101.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10131221231 is a prime.

It is a super-2 number, since 2×10131221231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10131221239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5065610615 + 5065610616.

It is an arithmetic number, because the mean of its divisors is an integer number (5065610616).

Almost surely, 2^10131221231 is an apocalyptic number.

10131221231 is a deficient number, since it is larger than the sum of its proper divisors (1).

10131221231 is an equidigital number, since it uses as much as digits as its factorization.

10131221231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 10131221231 its reverse (13212213101), we get a palindrome (23343434332).

The spelling of 10131221231 in words is "ten billion, one hundred thirty-one million, two hundred twenty-one thousand, two hundred thirty-one".