121340134423 has 4 divisors (see below), whose sum is σ = 122010522088. Its totient is φ = 120669746760.

The previous prime is 121340134403. The next prime is 121340134427. The reversal of 121340134423 is 324431043121.

It is a happy number.

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 121340134423 - 2⁹ = 121340133911 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121340134391 and 121340134400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121340134427) 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, 335193561 + ... + 335193922.

It is an arithmetic number, because the mean of its divisors is an integer number (30502630522).

Almost surely, 2^121340134423 is an apocalyptic number.

121340134423 is a deficient number, since it is larger than the sum of its proper divisors (670387665).

121340134423 is an equidigital number, since it uses as much as digits as its factorization.

121340134423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670387664.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 121340134423 its reverse (324431043121), we get a palindrome (445771177544).

The spelling of 121340134423 in words is "one hundred twenty-one billion, three hundred forty million, one hundred thirty-four thousand, four hundred twenty-three".