10810721261 has 4 divisors (see below), whose sum is σ = 10909902300. Its totient is φ = 10711540224.

The previous prime is 10810721221. The next prime is 10810721281. The reversal of 10810721261 is 16212701801.

10810721261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16212701801 = 1009 ⋅16068089.

It can be written as a sum of positive squares in 2 ways, for example, as 8706756100 + 2103965161 = 93310^2 + 45869^2 .

It is a cyclic number.

It is not a de Polignac number, because 10810721261 - 2¹⁰ = 10810720237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10810721221) 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 in 3 ways as a sum of consecutive naturals, for example, 49590356 + ... + 49590573.

It is an arithmetic number, because the mean of its divisors is an integer number (2727475575).

Almost surely, 2^10810721261 is an apocalyptic number.

It is an amenable number.

10810721261 is a deficient number, since it is larger than the sum of its proper divisors (99181039).

10810721261 is an equidigital number, since it uses as much as digits as its factorization.

10810721261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99181038.

The product of its (nonzero) digits is 1344, while the sum is 29.

The spelling of 10810721261 in words is "ten billion, eight hundred ten million, seven hundred twenty-one thousand, two hundred sixty-one".