12043211261 has 4 divisors (see below), whose sum is σ = 12045639900. Its totient is φ = 12040782624.

The previous prime is 12043211251. The next prime is 12043211267. The reversal of 12043211261 is 16211234021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16211234021 = 409 ⋅39636269.

It can be written as a sum of positive squares in 2 ways, for example, as 4613805625 + 7429405636 = 67925^2 + 86194^2 .

It is a cyclic number.

It is not a de Polignac number, because 12043211261 - 2¹⁰ = 12043210237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12043211267) 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, 1206866 + ... + 1216803.

It is an arithmetic number, because the mean of its divisors is an integer number (3011409975).

Almost surely, 2^12043211261 is an apocalyptic number.

It is an amenable number.

12043211261 is a deficient number, since it is larger than the sum of its proper divisors (2428639).

12043211261 is an equidigital number, since it uses as much as digits as its factorization.

12043211261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2428638.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 12043211261 its reverse (16211234021), we get a palindrome (28254445282).

The spelling of 12043211261 in words is "twelve billion, forty-three million, two hundred eleven thousand, two hundred sixty-one".