261121013367 has 4 divisors (see below), whose sum is σ = 348161351160. Its totient is φ = 174080675576.

The previous prime is 261121013339. The next prime is 261121013383. The reversal of 261121013367 is 763310121162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261121013367 - 2¹⁸ = 261120751223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261121013767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43520168892 + ... + 43520168897.

It is an arithmetic number, because the mean of its divisors is an integer number (87040337790).

Almost surely, 2^261121013367 is an apocalyptic number.

261121013367 is a deficient number, since it is larger than the sum of its proper divisors (87040337793).

261121013367 is an equidigital number, since it uses as much as digits as its factorization.

261121013367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87040337792.

The product of its (nonzero) digits is 9072, while the sum is 33.

The spelling of 261121013367 in words is "two hundred sixty-one billion, one hundred twenty-one million, thirteen thousand, three hundred sixty-seven".