23121011261 has 2 divisors, whose sum is σ = 23121011262. Its totient is φ = 23121011260.

The previous prime is 23121011237. The next prime is 23121011267. The reversal of 23121011261 is 16211012132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11614372900 + 11506638361 = 107770^2 + 107269^2 .

It is a cyclic number.

It is not a de Polignac number, because 23121011261 - 2¹⁸ = 23120749117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23121011267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11560505630 + 11560505631.

It is an arithmetic number, because the mean of its divisors is an integer number (11560505631).

Almost surely, 2^23121011261 is an apocalyptic number.

It is an amenable number.

23121011261 is a deficient number, since it is larger than the sum of its proper divisors (1).

23121011261 is an equidigital number, since it uses as much as digits as its factorization.

23121011261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 23121011261 its reverse (16211012132), we get a palindrome (39332023393).

The spelling of 23121011261 in words is "twenty-three billion, one hundred twenty-one million, eleven thousand, two hundred sixty-one".