101320321261 has 2 divisors, whose sum is σ = 101320321262. Its totient is φ = 101320321260.

The previous prime is 101320321189. The next prime is 101320321321. The reversal of 101320321261 is 162123023101.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89910022500 + 11410298761 = 299850^2 + 106819^2 .

It is a cyclic number.

It is not a de Polignac number, because 101320321261 - 2¹¹ = 101320319213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101320321061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50660160630 + 50660160631.

It is an arithmetic number, because the mean of its divisors is an integer number (50660160631).

Almost surely, 2^101320321261 is an apocalyptic number.

It is an amenable number.

101320321261 is a deficient number, since it is larger than the sum of its proper divisors (1).

101320321261 is an equidigital number, since it uses as much as digits as its factorization.

101320321261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 101320321261 its reverse (162123023101), we get a palindrome (263443344362).

The spelling of 101320321261 in words is "one hundred one billion, three hundred twenty million, three hundred twenty-one thousand, two hundred sixty-one".