55140324121 has 4 divisors (see below), whose sum is σ = 55140805044. Its totient is φ = 55139843200.

The previous prime is 55140324119. The next prime is 55140324133. The reversal of 55140324121 is 12142304155.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12142304155 = 5 ⋅2428460831.

It can be written as a sum of positive squares in 2 ways, for example, as 32206250521 + 22934073600 = 179461^2 + 151440^2 .

It is a cyclic number.

It is not a de Polignac number, because 55140324121 - 2¹ = 55140324119 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55140324121.

It is not an unprimeable number, because it can be changed into a prime (55140324521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42561 + ... + 334801.

It is an arithmetic number, because the mean of its divisors is an integer number (13785201261).

Almost surely, 2^55140324121 is an apocalyptic number.

It is an amenable number.

55140324121 is a deficient number, since it is larger than the sum of its proper divisors (480923).

55140324121 is a wasteful number, since it uses less digits than its factorization.

55140324121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480922.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 55140324121 its reverse (12142304155), we get a palindrome (67282628276).

The spelling of 55140324121 in words is "fifty-five billion, one hundred forty million, three hundred twenty-four thousand, one hundred twenty-one".