12134424421561 has 4 divisors (see below), whose sum is σ = 13067841684772. Its totient is φ = 11201007158352.

The previous prime is 12134424421547. The next prime is 12134424421607. The reversal of 12134424421561 is 16512442443121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2985275562025 + 9149148859536 = 1727795^2 + 3024756^2 .

It is a cyclic number.

It is not a de Polignac number, because 12134424421561 - 2⁵ = 12134424421529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12134424421961) 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, 466708631586 + ... + 466708631611.

It is an arithmetic number, because the mean of its divisors is an integer number (3266960421193).

Almost surely, 2^{12134424421561} is an apocalyptic number.

It is an amenable number.

12134424421561 is a deficient number, since it is larger than the sum of its proper divisors (933417263211).

12134424421561 is an equidigital number, since it uses as much as digits as its factorization.

12134424421561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933417263210.

The product of its digits is 184320, while the sum is 40.

Adding to 12134424421561 its reverse (16512442443121), we get a palindrome (28646866864682).

The spelling of 12134424421561 in words is "twelve trillion, one hundred thirty-four billion, four hundred twenty-four million, four hundred twenty-one thousand, five hundred sixty-one".