261121121033 has 2 divisors, whose sum is σ = 261121121034. Its totient is φ = 261121121032.

The previous prime is 261121121029. The next prime is 261121121077. The reversal of 261121121033 is 330121121162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193132123024 + 67988998009 = 439468^2 + 260747^2 .

It is a cyclic number.

It is not a de Polignac number, because 261121121033 - 2² = 261121121029 is a prime.

It is not a weakly prime, because it can be changed into another prime (261121121633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130560560516 + 130560560517.

It is an arithmetic number, because the mean of its divisors is an integer number (130560560517).

Almost surely, 2^261121121033 is an apocalyptic number.

It is an amenable number.

261121121033 is a deficient number, since it is larger than the sum of its proper divisors (1).

261121121033 is an equidigital number, since it uses as much as digits as its factorization.

261121121033 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 23.

Adding to 261121121033 its reverse (330121121162), we get a palindrome (591242242195).

The spelling of 261121121033 in words is "two hundred sixty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, thirty-three".