210131221331 has 2 divisors, whose sum is σ = 210131221332. Its totient is φ = 210131221330.

The previous prime is 210131221277. The next prime is 210131221367. The reversal of 210131221331 is 133122131012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210131221331 is a prime.

It is a super-2 number, since 2×210131221331² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (210131227331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105065610665 + 105065610666.

It is an arithmetic number, because the mean of its divisors is an integer number (105065610666).

Almost surely, 2^210131221331 is an apocalyptic number.

210131221331 is a deficient number, since it is larger than the sum of its proper divisors (1).

210131221331 is an equidigital number, since it uses as much as digits as its factorization.

210131221331 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 210131221331 its reverse (133122131012), we get a palindrome (343253352343).

The spelling of 210131221331 in words is "two hundred ten billion, one hundred thirty-one million, two hundred twenty-one thousand, three hundred thirty-one".